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Grygoryeva K, Rakovský J, Votava O, Fárník M. Long time scale dynamics of vibrationally excited (HBr) n clusters. J Chem Phys 2018; 149:094303. [PMID: 30195297 DOI: 10.1063/1.5034245] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We investigated the photodissociation dynamics of vibrationally excited HBr molecules and clusters. The species were generated in a molecular beam and excited with an IR laser to a v = 1 vibrational state. A subsequent ultraviolet (UV)-pulse with 243 nm radiation photolysed the molecules to yield H-fragments, which were resonantly ionized by the same UV-pulse (2 + 1 REMPI) and detected in a velocity map imaging (VMI) experiment. We performed action spectroscopy to distinguish between two expansion regimes: (i) expansion leading to isolated HBr molecules and (ii) generation of large (HBr)n clusters. Photodissociation of isolated HBr ( v = 1) molecules in particular J ro-vibrational states yielded faster H-fragments (by approximately 0.3 eV) with respect to the photodissociation of the ground state HBr ( v = 0). On the contrary, the IR excitation of molecules in (HBr) n clusters enhanced the yield of the H-fragments UV-photodissociated from the ground-state HBr ( v = 0) molecules. Our findings show that these molecules are photodissociated within clusters, and they are not free molecules evaporated from clusters after the IR excitation. Nanosecond IR-UV pump-probe experiments show that the IR-excitation enhances the H-fragment UV-photodissociation yield up to ∼100 ns after the IR excitation. After these long IR-UV delays, excitation of HBr molecules in clusters does not originate from the IR-excitation but from the UV-photodissociation and subsequent caging of HBr molecules in v > 0 states. We show that even after ∼100 ns the IR-excited larger (HBr) n clusters do not decay to individual molecules, and the excitation is still present in some form within these clusters enhancing their UV-photodissociation.
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Affiliation(s)
- K Grygoryeva
- J. Heyrovský Institute of Physical Chemistry v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, 18223 Prague, Czech Republic
| | - J Rakovský
- J. Heyrovský Institute of Physical Chemistry v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, 18223 Prague, Czech Republic
| | - O Votava
- J. Heyrovský Institute of Physical Chemistry v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, 18223 Prague, Czech Republic
| | - M Fárník
- J. Heyrovský Institute of Physical Chemistry v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, 18223 Prague, Czech Republic
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Broderick BM, Suits AG, Vasyutinskii OS. Rydberg Detection of Spin-Polarized Hydrogen Atoms in Chemical Reactions. J CHIN CHEM SOC-TAIP 2017. [DOI: 10.1002/jccs.201700162] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | - Arthur G. Suits
- Department of Chemistry; University of Missouri; Columbia MO 65211 USA
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Hróðmarsson HR, Kartakoullis A, Zaouris D, Glodic P, Wang H, Samartzis PC, Kvaran Á. Excitation dynamics involving homogeneous multistate interactions: one and two color VMI and REMPI of HBr. Phys Chem Chem Phys 2017; 19:11354-11365. [PMID: 28421209 DOI: 10.1039/c7cp00345e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Velocity map imaging (VMI) data and mass resolved REMPI spectra are complementarily utilized to elucidate the involvement of homogeneous multistate interactions in excited state dynamics of HBr. The H1Σ+(v' = 0) and E1Σ+(v' = 1) Rydberg states and the V1Σ+(v'= m + 7) and V1Σ+(v'= m + 8) ion-pair states are explored as a function of rotational quantum number in the two-photon excitation region of 79 100-80 700 cm-1. H+ and Br+ images were recorded by one- as well as two-color excitation schemes. Kinetic energy release (KER) spectra and angular distributions were extracted from the data. Strong-to-medium interactions between the E(1) and V(m + 8)/V(m + 7) states on one hand and the H(0) and V(m + 7)/V(m + 8) states on the other hand were quantified from peak shifts and intensity analysis of REMPI spectra. The effects of those interactions on subsequent photoionization and photolytic pathways of HBr were evaluated in one-color VMI experiments of the H+ and two-color VMI experiments of the Br+ photoproducts.
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Poterya V, Lengyel J, Pysanenko A, Svrčková P, Fárník M. Imaging of hydrogen halides photochemistry on argon and ice nanoparticles. J Chem Phys 2014; 141:074309. [DOI: 10.1063/1.4892585] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- V. Poterya
- J. Heyrovský Institute of Physical Chemistry v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, 18223 Prague, Czech Republic
| | - J. Lengyel
- J. Heyrovský Institute of Physical Chemistry v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, 18223 Prague, Czech Republic
| | - A. Pysanenko
- J. Heyrovský Institute of Physical Chemistry v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, 18223 Prague, Czech Republic
| | - P. Svrčková
- J. Heyrovský Institute of Physical Chemistry v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, 18223 Prague, Czech Republic
| | - M. Fárník
- J. Heyrovský Institute of Physical Chemistry v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, 18223 Prague, Czech Republic
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Poterya V, Kočišek J, Pysanenko A, Fárník M. Caging of Cl atoms from photodissociation of CF2Cl2in clusters. Phys Chem Chem Phys 2014; 16:421-9. [DOI: 10.1039/c3cp51926k] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Fárník M, Poterya V, Kočišek J, Fedor J, Slavíček P. Short review on the acetylene photochemistry in clusters: photofragment caging and reactivity. Mol Phys 2012. [DOI: 10.1080/00268976.2012.706389] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Michal Fárník
- a J. Heyrovský Institute of Physical Chemistry v.v.i , Academy of Sciences of the Czech Republic , Dolejškova 3, 18223 Prague , Czech Republic
| | - Viktoriya Poterya
- a J. Heyrovský Institute of Physical Chemistry v.v.i , Academy of Sciences of the Czech Republic , Dolejškova 3, 18223 Prague , Czech Republic
| | - Jaroslav Kočišek
- a J. Heyrovský Institute of Physical Chemistry v.v.i , Academy of Sciences of the Czech Republic , Dolejškova 3, 18223 Prague , Czech Republic
- b Faculty of Mathematics and Physics , Charles University Prague , Czech Republic
| | - Juraj Fedor
- a J. Heyrovský Institute of Physical Chemistry v.v.i , Academy of Sciences of the Czech Republic , Dolejškova 3, 18223 Prague , Czech Republic
| | - Petr Slavíček
- c Department of Physical Chemistry , Institute of Chemical Technology Prague , Technická 5, 16628 Prague 6 , Czech Republic
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7
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Poterya V, Šištík L, Slavíček P, Fárník M. Hydrogen bond dynamics in the excited states: Photodissociation of phenol in clusters. Phys Chem Chem Phys 2012; 14:8936-44. [DOI: 10.1039/c2cp40471k] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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8
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Fedor J, Kočišek J, Poterya V, Votava O, Pysanenko A, Lipciuc ML, Kitsopoulos TN, Fárník M. Velocity map imaging of HBr photodissociation in large rare gas clusters. J Chem Phys 2011; 134:154303. [DOI: 10.1063/1.3578610] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Slavíček P, Fárník M. Photochemistry of hydrogen bonded heterocycles probed by photodissociation experiments and ab initio methods. Phys Chem Chem Phys 2011; 13:12123-37. [DOI: 10.1039/c1cp20674e] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Poterya V, Fedor J, Pysanenko A, Tkáč O, Lengyel J, Ončák M, Slavíček P, Fárník M. Photochemistry of HI on argon and waternanoparticles: Hydronium radical generation in HI·(H2O)n. Phys Chem Chem Phys 2011; 13:2250-8. [DOI: 10.1039/c0cp01518k] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Affiliation(s)
- Udo Buck
- a Max-Planck Institut für Dynamik und Selbstorganisation , Bunsenstr , 10 D-37073 Göttingen , Germany
| | - Michal FáRníK
- b J. Heyrovský Institute of Physical Chemistry , Academy of Sciences of the Czech Republic , Prague 8 , Czech Republic
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Poterya V, Profant V, Fárník M, Šištík L, Slavíček P, Buck U. Photoinduced Processes in Hydrogen Bonded System: Photodissociation of Imidazole Clusters. J Phys Chem A 2009; 113:14583-90. [DOI: 10.1021/jp904145q] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | | | | | - Udo Buck
- Max-Planck Institut für Dynamik und Selbstorganisation, Bunsenstrasse 10, D-37073 Göttingen, Germany
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Fárník M, Poterya V, Votava O, Ončák M, Slavíček P, Dauster I, Buck U. Solvent-Induced Photostability of Acetylene Molecules in Clusters Probed by Multiphoton Dissociation. J Phys Chem A 2009; 113:7322-30. [DOI: 10.1021/jp811073j] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | | | | | - Ingo Dauster
- Institut für Physikalische Chemie, Universität Göttingen, Tammannstrasse 6, D-37077 Göttingen, Germany
| | - Udo Buck
- Max-Planck Institut für Dynamik and Selbstorganisation, Bunsenstrasse 10, D-37073 Göttingen, Germany
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Chen H, Hüwel L. Dissociative Ionization of Na2 via Repulsive Rydberg States: Elucidating Femtosecond Dynamics with Nanosecond Lasers. J Phys Chem A 2008; 112:9374-81. [DOI: 10.1021/jp802342d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Hong Chen
- Physics Department, Wesleyan University, Middletown, Connecticut 06459
| | - Lutz Hüwel
- Physics Department, Wesleyan University, Middletown, Connecticut 06459
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Valero R, Truhlar DG, Jasper AW. Adiabatic States Derived from a Spin-Coupled Diabatic Transformation: Semiclassical Trajectory Study of Photodissociation of HBr and the Construction of Potential Curves for LiBr+. J Phys Chem A 2008; 112:5756-69. [DOI: 10.1021/jp800738b] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rosendo Valero
- Department of Chemistry and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431
| | - Donald G. Truhlar
- Department of Chemistry and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431
| | - Ahren W. Jasper
- Combustion Research Facility, Sandia National Laboratories, P. O. Box 969, Livermore, California 94551-0969
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16
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Ončák M, Slavíček P, Poterya V, Fárník M, Buck U. Emergence of Charge-Transfer-to-Solvent Band in the Absorption Spectra of Hydrogen Halides on Ice Nanoparticles: Spectroscopic Evidence for Acidic Dissociation. J Phys Chem A 2008; 112:5344-53. [DOI: 10.1021/jp8012305] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | | | - Udo Buck
- Max-Planck Institut für Dynamik und Selbstorganization, Bunsenstrasse 10, D-37073 Göttingen, Germany
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17
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Poterya V, Votava O, Fárník M, Ončák M, Slavíček P, Buck U, Friedrich B. Generation and orientation of organoxenon molecule H–Xe–CCH in the gas phase. J Chem Phys 2008; 128:104313. [DOI: 10.1063/1.2837656] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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18
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Poterya V, Fárník M, Ončák M, Slavíček P. Water photodissociation in free ice nanoparticles at 243 nm and 193 nm. Phys Chem Chem Phys 2008; 10:4835-42. [DOI: 10.1039/b806865h] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Poterya V, Profant V, Fárník M, Slavícek P, Buck U. Experimental and theoretical study of the pyrrole cluster photochemistry: Closing the πσ* dissociation pathway by complexation. J Chem Phys 2007; 127:064307. [PMID: 17705596 DOI: 10.1063/1.2754687] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Photolysis of size selected pyrrole clusters has been investigated and compared to the photolysis of an isolated pyrrole molecule. Experimentally, size distributions of different mean cluster sizes (n=3 and n>>5) have been prepared in supersonic expansions and the clusters were photolyzed at 243 and 193 nm. The kinetic energy distributions of the H photofragments have been measured. The distributions exhibit a bimodal character with fast and slow H-fragment peaks similar to the spectra of the bare molecule. However, with increasing cluster size the slow component gains intensity with respect to the fast one. A similar effect is observed with increasing the excitation energy from 243 to 193 nm. Theoretical calculations at the CASSCF/CASPT2 level have been performed for bare and complexed pyrroles (pyrrole is complexed with an argon atom and with another pyrrole unit). Combination of theoretical and experimental approaches leads to the conclusion that the direct dissociative pathway along the pisigma* potential energy surface in the N-H stretch coordinate is closed by the presence of the solvent molecule. This pathway is an important channel leading to the fast H atoms in the dissociation of the bare molecule. The solvent molecule influences significantly the electronic structure in the Rydberg-type pisigma* state while it has little influence on the valence states. The slow channel is mostly populated by the out-of-plane deformation mode which is also not influenced by solvation. We have also studied other possible reaction channels in pyrrole clusters (hydrogen transfer, dimerization). The present study shows that more insight into the bulk behavior of biologically relevant molecules can be gained from cluster studies.
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Affiliation(s)
- Viktoriya Poterya
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Prague 8, Czech Republic
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Poterya V, Fárník M, Slavícek P, Buck U, Kresin VV. Photodissociation of hydrogen halide molecules on free ice nanoparticles. J Chem Phys 2007; 126:071101. [PMID: 17328585 DOI: 10.1063/1.2709635] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Photodissociation of water clusters doped with HX(X=Br,Cl), molecules has been studied in a molecular beam experiment. The HX(H2O)n clusters are dissociated with 193 nm laser pulses, and the H fragments are ionized at 243.07 nm and their time-of-flight distributions are measured. Experiments with deuterated species DBr(H2O)n and HBr(D2O)n suggest that the photodissociation signal originates from the presence of the HX molecule on the water cluster, but does not come directly from a photolysis of the HX molecule. The H fragment is proposed to originate from the hydronium molecule H3O. Possible mechanisms of the H3O production are discussed. Experimental evidence suggests that acidic dissociation takes place in the cluster, but the H3O+ ion remains rather immobile.
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Affiliation(s)
- Viktoriya Poterya
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Prague 8, Czech Republic
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21
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Koszinowski K, Goldberg NT, Pomerantz AE, Zare RN. Construction and calibration of an instrument for three-dimensional ion imaging. J Chem Phys 2006; 125:133503. [PMID: 17029486 DOI: 10.1063/1.2217742] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
We describe a new instrument based on a delay-line detector for imaging the complete three-dimensional velocity distribution of photoionized products from photoinitiated reactions. Doppler-free [2+1] resonantly enhanced multiphoton ionization (REMPI) of H and D atoms formed upon photolysis of HBr and DBr in the range 203 nm < or = lambda photolysis < or = 243 nm yields radial speeds measured to be accurate within 1% of those calculated. The relative speed resolution is about 5% and limited by photoionization recoil broadening. A relative speed resolution of 3.4% is obtained for [3+1] REMPI, which minimizes the ionization recoil. We also determine the branching ratio between ground-state and spin-orbit-excited product channels and their associated anisotropies. We find that DBr photolysis dynamics differs slightly from its HBr counterpart.
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Affiliation(s)
- Konrad Koszinowski
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA
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Abstract
We demonstrate a two-color reduced-Doppler probe for ion imaging that, in many applications, offers advantages over conventional 2+1 resonance-enhanced multiphoton ionization detection. Using counterpropagating beams of two different colors, one of which is broadband 266 nm, we achieve convenient and sensitive D atom detection without the need for Doppler scanning. We demonstrate the approach using 224 nm photodissociation of DBr. This method improves the sensitivity and signal-to-noise ratio and presents advantages and opportunities for use in the other systems.
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Affiliation(s)
- Cunshun Huang
- Department of Chemistry, Wayne State University, Detroit, MI 48202, USA
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Smolin AG, Vasyutinskii OS, Balint-Kurti GG, Brown A. Photodissociation of HBr. 1. Electronic Structure, Photodissociation Dynamics, and Vector Correlation Coefficients. J Phys Chem A 2006; 110:5371-8. [PMID: 16623464 DOI: 10.1021/jp0562429] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Ab initio potential energy curves, transition dipole moments, and spin-orbit coupling matrix elements are computed for HBr. These are then used, within the framework of time-dependent quantum-mechanical wave-packet calculations, to study the photodissociation dynamics of the molecule. Total and partial integral cross sections, the branching fraction for the formation of excited-state bromine atoms Br(2P(1/2)), and the lowest order anisotropy parameters, beta, for both ground and excited-state bromine are calculated as a function of photolysis energy and compared to experimental and theoretical data determined previously. Higher order anisotropy parameters are computed for the first time for HBr and compared to recent experimental measurements. A new expression for the Re[a1(3) (parallel, perpendicular)] parameter describing coherent parallel and perpendicular production of ground-state bromine in terms of the dynamical functions is given. Although good agreement is obtained between the theoretical predictions and the experimental measurements, the discrepancies are analyzed to establish how improvements might be achieved. Insight is obtained into the nonadiabatic dynamics by comparing the results of diabatic and fully adiabatic calculations.
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Affiliation(s)
- Andrey G Smolin
- Ioffe Physico-Technical Institute Russian Academy of Sciences, 194021 St.-Petersburg, Russia.
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Huang C, Lahankar SA, Hwa Kim M, Zhang B, Suits AG. Doppler-free/Doppler-sliced ion imaging. Phys Chem Chem Phys 2006; 8:4652-4. [PMID: 17047761 DOI: 10.1039/b612324d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We demonstrate a hybrid Doppler-free/Doppler-sliced ion imaging approach that is well-suited for detection of H or D atoms. The method relies on 2 + 1 resonant ionization with identical, nearly counterpropagating beams that are coplanar but directed at a small angle relative to the detector face. This results in Doppler selection of the velocity component along the time of flight axis but Doppler-free detection in the plane perpendicular to this axis. The results show high signal level and excellent slicing ( approximately 5%), yielding velocity resolution completely determined by cation recoil in the ionization step.
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Affiliation(s)
- Cunshun Huang
- Department of Chemistry, Wayne State University, Detroit, MI 48202, USA
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25
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Fárník M, Nahler NH, Buck U, Slavíček P, Jungwirth P. Photodissociation of HBr on the surface of Arn clusters at 193nm. Chem Phys 2005. [DOI: 10.1016/j.chemphys.2005.03.025] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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26
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Jodoin DN, Brown A. Photodissociation of HI and DI: Testing models for electronic structure via polarization of atomic photofragments. J Chem Phys 2005; 123:054301. [PMID: 16108633 DOI: 10.1063/1.1989327] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The photodissociation dynamics of HI and DI are examined using time-dependent wave-packet techniques. The orientation and alignment parameters aQ(K) (p) are determined as a function of photolysis energy for the resulting ground-state I(2P(3/2)) and excited-state I(2P(1/2)) atoms. The aQ(K) (p) parameters describe the coherent and incoherent contributions to the angular momentum distributions from the A 1pi(1), a 3pi(1), and t 3sigma(1) electronic states accessed by perpendicular excitation and the a 3pi(0+) state accessed by a parallel transition. The outcomes of the dynamics based on both shifted ab initio results and three empirical models for the potential-energy curves and transition dipole moments are compared and contrasted. It is demonstrated that experimental measurement of the aQ(K) (p) parameters for the excitation from the vibrational ground state (upsilon=0) would be able to distinguish between the available models for the HI potential-energy curves and transition dipole moments. The differences between the aQ(K) (p) parameters for the excitation from upsilon=0 stand in sharp contrast to the scalar properties, i.e., total cross section and I* branching fraction, which require experimental measurement of photodissociation from excited vibrational states (upsilon>0) to distinguish between the models.
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Affiliation(s)
- David N Jodoin
- Department of Chemistry, University of Alberta, Edmonton AB T6G 2G2, Canada
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Rakitzis TP, Samartzis PC, Toomes RL, Kitsopoulos TN. Measurement of Br photofragment orientation and alignment from HBr photodissociation: Production of highly spin-polarized hydrogen atoms. J Chem Phys 2004; 121:7222-7. [PMID: 15473789 DOI: 10.1063/1.1794691] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
The orientation and alignment of the (2)P(3/2) and (2)P(1/2) Br photofragments from the photodissociation of HBr is measured at 193 nm in terms of a(q) ((k))(p) parameters, using slice imaging. The A (1)Pi state is excited almost exclusively, and the measured a(q) ((k))(p) parameters and the spin-orbit branching ratio show that the dissociation proceeds predominantly via nonadiabatic transitions to the a (3)Pi and 1 (3)Sigma(+) states. Conservation of angular momentum shows that the electrons of the nascent H atom cofragments (recoiling parallel to the photolysis polarization) are highly spin polarized: about 100% for the Br((2)P(1/2)) channel, and 86% for the Br((2)P(3/2)) channel. A similar analysis is demonstrated for the photodissociation of HCl.
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Affiliation(s)
- T Peter Rakitzis
- Department of Physics, University of Crete, P.O. 2208, 71003 Voutes-Heraklion, Greece
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Nahler NH, Farnik M, Buck U, Vach H, Gerber RB. Photodissociation of HCl and small (HCl)m complexes in and on large Arn clusters. J Chem Phys 2004; 121:1293-302. [PMID: 15260671 DOI: 10.1063/1.1763570] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Photodissociation experiments were carried out at 193 nm for single HCl molecules which are adsorbed on the surface of large Ar n clusters and small (HCl)m complexes which are embedded in the interior of these clusters. For the surface case the size dependence is measured for the average sizes n=140-1000. No cage exit events are observed in agreement with the substitutional position of the molecule deeply buried in the outermost shell. This result is confirmed by a molecular dynamics simulation of the pickup process under realistic conditions concerning the experiment and the interaction potentials. The calculations of the dissociation process employ the surface hopping model. For the embedded case the average sizes covered are m=3 and 6 and n=8-248. The kinetic energy of the H atom fragments is measured exhibiting peaks at zero and around 2.0 eV which mark completely caged and unperturbed fragments, respectively. The ratio of theses peaks strongly depends on the cluster size and agrees well with theoretical predictions for one and two closed icosahedral shells, in which the nonadiabatic coupling of all states was accounted for.
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Affiliation(s)
- N Hendrik Nahler
- Max-Planck-Institut fur Stromungsforschung, Bunsenstrasse 10, 37073 Gottingen, Germany
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29
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Camden JP, Bechtel HA, Ankeny Brown DJ, Pomerantz AE, Zare RN, Le Roy RJ. Probing Excited Electronic States Using Vibrationally Mediated Photolysis: Application to Hydrogen Iodide. J Phys Chem A 2004. [DOI: 10.1021/jp049051z] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Jon P. Camden
- Department of Chemistry, Stanford University, Stanford, California 94305-5080
| | - Hans A. Bechtel
- Department of Chemistry, Stanford University, Stanford, California 94305-5080
| | | | - Andrew E. Pomerantz
- Department of Chemistry, Stanford University, Stanford, California 94305-5080
| | - Richard N. Zare
- Department of Chemistry, Stanford University, Stanford, California 94305-5080
| | - Robert J. Le Roy
- Guelph-Waterloo Centre for Graduate Work in Chemistry and Biochemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
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30
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Hendrik Nahler N, Fárnı́k M, Buck U. Search for oriented HXeX molecules from the photolysis of HCl and HBr in xenon clusters. Chem Phys 2004. [DOI: 10.1016/j.chemphys.2003.11.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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31
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Slice imaging of H-atom photofragments: effects of the REMPI detection process on the observed velocity distribution. Chem Phys 2004. [DOI: 10.1016/j.chemphys.2003.11.038] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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32
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Slavicek P, Jungwirth P, Lewerenz M, Nahler NH, Farnik M, Buck U. Photodissociation of hydrogen iodide on the surface of large argon clusters: The orientation of the librational wave function and the scattering from the cluster cage. J Chem Phys 2004; 120:4498-511. [PMID: 15268618 DOI: 10.1063/1.1643895] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A set of photodissociation experiments and simulations of hydrogen iodide (HI) on Arn clusters, with an average size n = 139, has been carried out for different laser polarizations. The doped clusters are prepared by a pick-up process. The HI molecule is then photodissociated by a UV laser pulse and the outgoing H fragment is ionized by resonance enhanced multiphoton ionization in a (2 + 1) excitation scheme within the same laser pulse at the wavelength of 243 nm. The measured time-of-flight spectra are transformed into hydrogen kinetic energy distributions. They exhibit a strong fraction of caged H atoms at zero-kinetic energy and peaks at the unperturbed cage exit for both spin-orbit channels nearly independent of the polarization. At this dissociation wavelength, the bare HI molecule exhibits a strict state separation, with a parallel transition to the spin-orbit excited state and perpendicular transitions to the ground state. The experimental results have been reproduced using molecular simulation techniques. Classical molecular dynamics was used to estimate the HI dopant distribution after the pick-up procedure. Subsequently, quasi-classical molecular dynamics (Wigner trajectories approach) has been applied for the photodissociation dynamics. The following main results have been obtained: (i) The HI dopant lands on the surface of the argon cluster during the pick-up process, (ii) zero-point energy plays a dominant role for the hydrogen orientation in the ground state of HI-Arn surface clusters, qualitatively changing the result of the photodissociation experiment upon increasing the number of argon atoms, and, finally, (iii) the scattering of hydrogen atoms from the cage which originate from different dissociation states seriously affects the experimentally measured kinetic energy distributions.
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Affiliation(s)
- Petr Slavicek
- J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Center for Complex Molecular Systems and Biomolecules, Dolejskova 3, 18223 Prague 8, Czech Republic
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33
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Slavíček P, Jungwirth P, Lewerenz M, Nahler NH, Fárník M, Buck U. Pickup and Photodissociation of Hydrogen Halides in Floppy Neon Clusters. J Phys Chem A 2003. [DOI: 10.1021/jp0357525] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | - Marius Lewerenz
- LADIR/Spectrochimie Moléculaire, UMR 7075, Bâtiment F74, Bte 49, Université Pierre et Marie Curie, F-75252 Paris Cedex 05, France
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34
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Nahler NH, Baumfalk R, Buck U, Bihary Z, Gerber RB, Friedrich B. Photodissociation of oriented HXeI molecules generated from HI–Xen clusters. J Chem Phys 2003. [DOI: 10.1063/1.1577311] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
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35
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Prosmiti R, García-Vela A. Photodissociation Quantum Dynamics of the Ar−HF(v = 0) Cluster. J Phys Chem A 2003. [DOI: 10.1021/jp0303873] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- R. Prosmiti
- Instituto de Matemáticas y Fısica Fundamental, C.S.I.C., Serrano 123, 28006 Madrid, Spain
| | - A. García-Vela
- Instituto de Matemáticas y Fısica Fundamental, C.S.I.C., Serrano 123, 28006 Madrid, Spain
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36
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Prosmiti R, Garcı́a-Vela A. Wave packet study of the Ar–HBr photolysis: Stereodynamical effects. J Chem Phys 2003. [DOI: 10.1063/1.1565312] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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37
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Hendrik Nahler N, Baumfalk R, Buck U, Vach H, Slavíček P, Jungwirth P. Photodissociation of HBr in and on Arnclusters: the role of the position of the molecule. Phys Chem Chem Phys 2003. [DOI: 10.1039/b304511k] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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38
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Buck U. Photodissociation of Hydrogen Halide Molecules in Different Cluster Environments. J Phys Chem A 2002. [DOI: 10.1021/jp0208079] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Udo Buck
- Max-Planck-Institut für Strömungsforschung, Bunsenstrasse 10, D-37073 Göttingen, Germany
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39
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40
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Prosmiti R, Garcı́a-Vela A. Stereodynamics and control effects in the ultraviolet photolysis of Ar–HBr. J Chem Phys 2002. [DOI: 10.1063/1.1480866] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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41
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Juanes-Marcos JC, García-Vela A. Quantum Interference Effects in the Ultraviolet Photolysis of Ar−HCl Following Total Fragmentation into H + Ar + Cl. J Phys Chem A 2002. [DOI: 10.1021/jp020081g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- J. C. Juanes-Marcos
- Instituto de Matemáticas y Física Fundamental, CSIC, Serrano 123, 28006 Madrid, Spain
| | - A. García-Vela
- Instituto de Matemáticas y Física Fundamental, CSIC, Serrano 123, 28006 Madrid, Spain
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42
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Juanes-Marcos JC, García-Vela A. Quantum Interference Effects in the Ultraviolet Photolysis of Ar−HCl Following Partial Fragmentation into H + Ar−Cl. J Phys Chem A 2001. [DOI: 10.1021/jp0136213] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- J. C. Juanes-Marcos
- Instituto de Matemáticas y Fısica Fundamental, C.S.I.C., Serrano 123, 28006 Madrid, Spain
| | - A. García-Vela
- Instituto de Matemáticas y Fısica Fundamental, C.S.I.C., Serrano 123, 28006 Madrid, Spain
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43
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Baumfalk R, Nahler NH, Buck U. Photodissociation of oriented HXeI molecules in the gas phase. J Chem Phys 2001. [DOI: 10.1063/1.1354144] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
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44
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Aoiz FJ, Bañares L, Bohm T, Hanf A, Herrero VJ, Jung KH, Läuter A, Lee KW, Menéndez M, Sáez Rábanos V, Tanarro I, Volpp HR, Wolfrum J. Experimental and Theoretical Reaction Cross Sections for the H + HCl System. J Phys Chem A 2000. [DOI: 10.1021/jp001555j] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- F. J. Aoiz
- Departamento de Química Física, Facultad de Química, Universidad Complutense, 28940 Madrid, Spain, Physikalisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany, Instituto de Estructura de la Materia (CSIC), Serrano 123, 28006 Madrid, Spain, Department of Chemistry and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology, Taeduck Science Town, Taejon 305-701, Korea, and Departamento de Química General y Bioquímica, ETSI
| | - L. Bañares
- Departamento de Química Física, Facultad de Química, Universidad Complutense, 28940 Madrid, Spain, Physikalisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany, Instituto de Estructura de la Materia (CSIC), Serrano 123, 28006 Madrid, Spain, Department of Chemistry and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology, Taeduck Science Town, Taejon 305-701, Korea, and Departamento de Química General y Bioquímica, ETSI
| | - T. Bohm
- Departamento de Química Física, Facultad de Química, Universidad Complutense, 28940 Madrid, Spain, Physikalisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany, Instituto de Estructura de la Materia (CSIC), Serrano 123, 28006 Madrid, Spain, Department of Chemistry and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology, Taeduck Science Town, Taejon 305-701, Korea, and Departamento de Química General y Bioquímica, ETSI
| | - A. Hanf
- Departamento de Química Física, Facultad de Química, Universidad Complutense, 28940 Madrid, Spain, Physikalisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany, Instituto de Estructura de la Materia (CSIC), Serrano 123, 28006 Madrid, Spain, Department of Chemistry and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology, Taeduck Science Town, Taejon 305-701, Korea, and Departamento de Química General y Bioquímica, ETSI
| | - V. J. Herrero
- Departamento de Química Física, Facultad de Química, Universidad Complutense, 28940 Madrid, Spain, Physikalisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany, Instituto de Estructura de la Materia (CSIC), Serrano 123, 28006 Madrid, Spain, Department of Chemistry and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology, Taeduck Science Town, Taejon 305-701, Korea, and Departamento de Química General y Bioquímica, ETSI
| | - K.-H. Jung
- Departamento de Química Física, Facultad de Química, Universidad Complutense, 28940 Madrid, Spain, Physikalisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany, Instituto de Estructura de la Materia (CSIC), Serrano 123, 28006 Madrid, Spain, Department of Chemistry and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology, Taeduck Science Town, Taejon 305-701, Korea, and Departamento de Química General y Bioquímica, ETSI
| | - A. Läuter
- Departamento de Química Física, Facultad de Química, Universidad Complutense, 28940 Madrid, Spain, Physikalisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany, Instituto de Estructura de la Materia (CSIC), Serrano 123, 28006 Madrid, Spain, Department of Chemistry and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology, Taeduck Science Town, Taejon 305-701, Korea, and Departamento de Química General y Bioquímica, ETSI
| | - K. W. Lee
- Departamento de Química Física, Facultad de Química, Universidad Complutense, 28940 Madrid, Spain, Physikalisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany, Instituto de Estructura de la Materia (CSIC), Serrano 123, 28006 Madrid, Spain, Department of Chemistry and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology, Taeduck Science Town, Taejon 305-701, Korea, and Departamento de Química General y Bioquímica, ETSI
| | - M. Menéndez
- Departamento de Química Física, Facultad de Química, Universidad Complutense, 28940 Madrid, Spain, Physikalisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany, Instituto de Estructura de la Materia (CSIC), Serrano 123, 28006 Madrid, Spain, Department of Chemistry and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology, Taeduck Science Town, Taejon 305-701, Korea, and Departamento de Química General y Bioquímica, ETSI
| | - V. Sáez Rábanos
- Departamento de Química Física, Facultad de Química, Universidad Complutense, 28940 Madrid, Spain, Physikalisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany, Instituto de Estructura de la Materia (CSIC), Serrano 123, 28006 Madrid, Spain, Department of Chemistry and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology, Taeduck Science Town, Taejon 305-701, Korea, and Departamento de Química General y Bioquímica, ETSI
| | - I. Tanarro
- Departamento de Química Física, Facultad de Química, Universidad Complutense, 28940 Madrid, Spain, Physikalisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany, Instituto de Estructura de la Materia (CSIC), Serrano 123, 28006 Madrid, Spain, Department of Chemistry and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology, Taeduck Science Town, Taejon 305-701, Korea, and Departamento de Química General y Bioquímica, ETSI
| | - H.-R. Volpp
- Departamento de Química Física, Facultad de Química, Universidad Complutense, 28940 Madrid, Spain, Physikalisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany, Instituto de Estructura de la Materia (CSIC), Serrano 123, 28006 Madrid, Spain, Department of Chemistry and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology, Taeduck Science Town, Taejon 305-701, Korea, and Departamento de Química General y Bioquímica, ETSI
| | - J. Wolfrum
- Departamento de Química Física, Facultad de Química, Universidad Complutense, 28940 Madrid, Spain, Physikalisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany, Instituto de Estructura de la Materia (CSIC), Serrano 123, 28006 Madrid, Spain, Department of Chemistry and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology, Taeduck Science Town, Taejon 305-701, Korea, and Departamento de Química General y Bioquímica, ETSI
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45
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Brown A, Balint-Kurti GG. Spin–orbit branching in the photodissociation of HF and DF. II. A time-dependent wave packet study of vibrationally mediated photodissociation. J Chem Phys 2000. [DOI: 10.1063/1.481991] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
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46
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Slavíček P, Žďánská P, Jungwirth P, Baumfalk R, Buck U. Size Effects on Photodissociation and Caging of Hydrogen Bromide Inside or on the Surface of Large Inert Clusters: From One to Three Icosahedral Argon Layers. J Phys Chem A 2000. [DOI: 10.1021/jp001262q] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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47
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Baumfalk R, Nahler NH, Buck U, Niv MY, Gerber RB. Photodissociation of HBr adsorbed on the surface and embedded in large Arn clusters. J Chem Phys 2000. [DOI: 10.1063/1.481798] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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48
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Regan PM, Ascenzi D, Clementi C, Ashfold MN, Orr-Ewing AJ. The UV photodissociation of HI revisited: REMPI measurements of I(2P) atom spin–orbit branching fractions. Chem Phys Lett 1999. [DOI: 10.1016/s0009-2614(99)01223-3] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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