1
|
Parsons BF, Rivera MR, Onder MK. NO (A) Rotational State Distributions from Photodissociation of the N 2-NO Complex. J Phys Chem A 2022; 126:5729-5737. [PMID: 35994689 DOI: 10.1021/acs.jpca.2c04265] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have recorded the resonance-enhanced multiphoton ionization spectrum for NO (A) products from photodissociation of the N2-NO complex. We made measurements at excitation energies ranging from 28 to 758 cm-1 above the threshold to produce NO (A) + N2 (X) products, and the resulting spectra reveal the NO (A) rotational states formed during dissociation, allowing us to determine the rotational state distribution. At the lowest available energies, 28 and 50 cm-1 above threshold, we observed contributions from NO (A) rotational states that exceed the available energy and must originate from excitation due to hotbands of the complex. At all higher energies, we did not observe any energetically disallowed NO (A) rotational states, and for all available energies above 259 cm-1 the observed rotational transitions do not extend to the maximum allowed by energy conservation. Furthermore, the observed distributions were typically biased toward low rotational states, in contrast with expectations from vibrational predissociation. From the rotational state distributions, we determined the average fraction of energy partitioned into NO (A) rotation, fNO rot, ave, to be 0.088 at the highest available energy, and this fraction increased as the available energy decreased. By combining the average NO (A) rotational energy along with the average center-of-mass translational energy from our previous work, we determined the average rotational energy for the undetected N2 (X) photoproduct. The results showed that the N2 fragment has a higher average rotational energy relative to the NO fragment. Finally, we found that the NO (A) rotational state distribution was colder than expected for a statistical dissociation.
Collapse
Affiliation(s)
- Bradley F Parsons
- Department of Chemistry and Biochemistry, Creighton University, 2500 California Plaza, Omaha, Nebraska 68178, United States
| | - Marcos R Rivera
- Department of Chemistry and Biochemistry, Creighton University, 2500 California Plaza, Omaha, Nebraska 68178, United States
| | - Michael K Onder
- Department of Chemistry and Biochemistry, Creighton University, 2500 California Plaza, Omaha, Nebraska 68178, United States
| |
Collapse
|
2
|
Ivanov MV, Gulania S, Krylov AI. Two Cycling Centers in One Molecule: Communication by Through-Bond Interactions and Entanglement of the Unpaired Electrons. J Phys Chem Lett 2020; 11:1297-1304. [PMID: 31973526 DOI: 10.1021/acs.jpclett.0c00021] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Many applications in quantum information science (QIS) rely on the ability to laser-cool molecules. The scope of applications can be expanded if laser-coolable molecules possess two or more cycling centers, i.e., moieties capable of scattering photons via multiple absorption-emission events. Here we employ the equation-of-motion coupled-cluster method for double electron attachment (EOM-DEA-CCSD) to study the electronic structure of hypermetallic molecules with two alkaline-earth metals connected by an acetylene linker. The electronic structure of the molecules is similar to that of two separated alkali metals; however, the interaction between the two electrons is weak and largely dominated by through-bond interactions. The communication between the two cycling centers is quantified by the extent of the entanglement of the two unpaired electrons associated with the two cycling centers. This contribution highlights the rich electronic structure of hypermetallic molecules that may advance various applications in QIS and beyond.
Collapse
Affiliation(s)
- Maxim V Ivanov
- Department of Chemistry , University of Southern California , Los Angeles , California 90089 , United States
| | - Sahil Gulania
- Department of Chemistry , University of Southern California , Los Angeles , California 90089 , United States
| | - Anna I Krylov
- Department of Chemistry , University of Southern California , Los Angeles , California 90089 , United States
| |
Collapse
|
3
|
Seifert NA, Zaleski DP, Fehnel R, Goswami M, Pate BH, Lehmann KK, Leung HO, Marshall MD, Stanton JF. The gas-phase structure of the asymmetric, trans-dinitrogen tetroxide (N 2O 4), formed by dimerization of nitrogen dioxide (NO 2), from rotational spectroscopy and ab initio quantum chemistry. J Chem Phys 2018; 146:134305. [PMID: 28390374 DOI: 10.1063/1.4979182] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report the first experimental gas-phase observation of an asymmetric, trans-N2O4 formed by the dimerization of NO2. In additional to the dominant 14N216O4 species, rotational transitions have been observed for all species with single 15N and 18O substitutions as well as several multiply substituted isotopologues. These transitions were used to determine a complete substitution structure as well as an r0 structure from the fitted zero-point averaged rotational constants. The determined structure is found to be that of an ON-O-NO2 linkage with the shared oxygen atom closer to the NO2 than the NO (1.42 vs 1.61 Å). The structure is found to be nearly planar with a trans O-N-O-N linkage. From the spectra of the 14N15NO4 species, we were able to determine the nuclear quadrupole coupling constants for each specific nitrogen atom. The equilibrium structure determined by ab initio quantum chemistry calculations is in excellent agreement with the experimentally determined structure. No spectral evidence of the predicted asymmetric, cis-N2O4 was found in the spectra.
Collapse
Affiliation(s)
- Nathan A Seifert
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22932, USA
| | - Daniel P Zaleski
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22932, USA
| | - Robert Fehnel
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22932, USADepartments of Chemistry and Physics, University of Virginia, Charlottesville, Virginia 22932, USADepartment of Chemistry, Amherst College, Amherst, Massachusetts 01002, USADepartment of Chemistry and Quantum Theory Project, University of Florida, Gainesville, Florida 32603, USA
| | - Mausumi Goswami
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22932, USA
| | - Brooks H Pate
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22932, USA
| | - Kevin K Lehmann
- Departments of Chemistry and Physics, University of Virginia, Charlottesville, Virginia 22932, USA
| | - Helen O Leung
- Department of Chemistry, Amherst College, Amherst, Massachusetts 01002, USA
| | - Mark D Marshall
- Department of Chemistry, Amherst College, Amherst, Massachusetts 01002, USA
| | - John F Stanton
- Department of Chemistry and Quantum Theory Project, University of Florida, Gainesville, Florida 32603, USA
| |
Collapse
|
4
|
Ding X, Haertelt M, Schlauderer S, Schuurman MS, Naumov AY, Villeneuve DM, McKellar ARW, Corkum PB, Staudte A. Ultrafast Dissociation of Metastable CO^{2+} in a Dimer. PHYSICAL REVIEW LETTERS 2017; 118:153001. [PMID: 28452539 DOI: 10.1103/physrevlett.118.153001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Indexed: 06/07/2023]
Abstract
We triply ionize the van der Waals bound carbon monoxide dimer with intense ultrashort pulses and study the breakup channel (CO)_{2}^{3+}→C^{+}+O^{+}+CO^{+}. The fragments are recorded in a cold target recoil ion momentum spectrometer. We observe a fast CO^{2+} dissociation channel in the dimer, which does not exist for the monomer. We found that a nearby charge breaks the symmetry of a X^{3}Π state of CO^{2+} and induces an avoided crossing that allows a fast dissociation. Calculation on the full dimer complex shows the coupling of different charge states, as predicted from excimer theory, gives rise to electronic state components not present in the monomer, thereby enabling fast dissociation with higher kinetic energy release. These results demonstrate that the electronic structure of molecular cluster complexes can give rise to dynamics that is qualitatively different from that observed in the component monomers.
Collapse
Affiliation(s)
- Xiaoyan Ding
- Joint Attosecond Science Laboratory, National Research Council and University of Ottawa, Ottawa, Ontario, Canada K1A 0R6
| | - M Haertelt
- Joint Attosecond Science Laboratory, National Research Council and University of Ottawa, Ottawa, Ontario, Canada K1A 0R6
| | - S Schlauderer
- Joint Attosecond Science Laboratory, National Research Council and University of Ottawa, Ottawa, Ontario, Canada K1A 0R6
| | - M S Schuurman
- National Research Council, 100 Sussex Dr., Ottawa, Ontario, Canada K1A 0R6
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie, Ottawa, Canada K1N 6N5
| | - A Yu Naumov
- Joint Attosecond Science Laboratory, National Research Council and University of Ottawa, Ottawa, Ontario, Canada K1A 0R6
| | - D M Villeneuve
- Joint Attosecond Science Laboratory, National Research Council and University of Ottawa, Ottawa, Ontario, Canada K1A 0R6
| | - A R W McKellar
- National Research Council, 100 Sussex Dr., Ottawa, Ontario, Canada K1A 0R6
| | - P B Corkum
- Joint Attosecond Science Laboratory, National Research Council and University of Ottawa, Ottawa, Ontario, Canada K1A 0R6
| | - A Staudte
- Joint Attosecond Science Laboratory, National Research Council and University of Ottawa, Ottawa, Ontario, Canada K1A 0R6
| |
Collapse
|
5
|
Iyer ESS, Sadybekov A, Lioubashevski O, Krylov AI, Ruhman S. Rewriting the Story of Excimer Formation in Liquid Benzene. J Phys Chem A 2017; 121:1962-1975. [DOI: 10.1021/acs.jpca.7b01070] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- E. Siva Subramaniam Iyer
- Institute
of Chemistry, The Hebrew University of Jerusalem, Givat Ram, Jerusalem 9190401, Israel
| | - Arman Sadybekov
- Department
of Chemistry, University of Southern California, Los Angeles, California 90089-0482, United States
| | - Oleg Lioubashevski
- Institute
of Chemistry, The Hebrew University of Jerusalem, Givat Ram, Jerusalem 9190401, Israel
| | - Anna I. Krylov
- Department
of Chemistry, University of Southern California, Los Angeles, California 90089-0482, United States
| | - Sanford Ruhman
- Institute
of Chemistry, The Hebrew University of Jerusalem, Givat Ram, Jerusalem 9190401, Israel
| |
Collapse
|
6
|
Gerber RB, Shemesh D, Varner ME, Kalinowski J, Hirshberg B. Ab initio and semi-empirical Molecular Dynamics simulations of chemical reactions in isolated molecules and in clusters. Phys Chem Chem Phys 2014; 16:9760-75. [DOI: 10.1039/c3cp55239j] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Recent progress in “on-the-fly” trajectory simulations of molecular reactions, using different electronic structure methods is discussed, with analysis of the insights that such calculations can provide and of the strengths and limitations of the algorithms available.
Collapse
Affiliation(s)
- R. B. Gerber
- Institute of Chemistry and The Fritz Haber Research Center
- The Hebrew University of Jerusalem
- Jerusalem 91904, Israel
- Department of Chemistry
- University of California
| | - D. Shemesh
- Institute of Chemistry and The Fritz Haber Research Center
- The Hebrew University of Jerusalem
- Jerusalem 91904, Israel
| | - M. E. Varner
- Department of Chemistry
- University of California
- Irvine 92697, USA
| | - J. Kalinowski
- Department of Chemistry
- University of Helsinki
- , Finland
| | - B. Hirshberg
- Institute of Chemistry and The Fritz Haber Research Center
- The Hebrew University of Jerusalem
- Jerusalem 91904, Israel
| |
Collapse
|
7
|
Liu F, Proynov E, Yu JG, Furlani TR, Kong J. Comparison of the performance of exact-exchange-based density functional methods. J Chem Phys 2012; 137:114104. [PMID: 22998246 PMCID: PMC3465352 DOI: 10.1063/1.4752396] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2012] [Accepted: 08/29/2012] [Indexed: 01/18/2023] Open
Abstract
How to describe nondynamic electron correlation is still a major challenge to density functional theory (DFT). Recent models designed particularly for this problem, such as Becke'05 (B05) and Perdew-Staroverov-Tao-Scuseria (PSTS) functionals employ the exact-exchange density, the efficient calculation of which is technically quite challenging. We have recently implemented self-consistently the B05 functional based on an efficient resolution-identity (RI) technique. In this study, we report a self-consistent RI implementation of the PSTS functional. In contrast to its original implementation, our version brings no limitation on the choice of the basis set. We have also implemented the Mori-Sanchez-Cohen-Yang-2 (MCY2) functional, another recent DFT method that includes full exact exchange. The performance of PSTS, B05, and MCY2 is validated on thermochemistry, reaction barriers, and dissociation energy curves, with an emphasis on nondynamic correlation effects in the discussion. All three methods perform rather well in general, B05 and MCY2 being on average somewhat better than PSTS. We include also results with other functionals that represent various aspects of the development in this field in recent years, including B3LYP, M06-HF, M06-2X, ωB97X, and TPSSh. The performance of the heavy-parameterized functionals M06-2X and ωB97X is on average better than that of B05, MCY2, and PSTS for standard thermodynamic properties and reactions, while the latter functionals do better in hydrogen abstraction reactions and dissociation processes. In particular, B05 is found to be the only functional that yields qualitatively correct dissociation curves for two-center symmetric radicals like He(2)(+). Finally, we compare the performance of all these functionals on a strongly correlated exemplary case system, the NO dimer. Only PSTS, B05, and MCY2 describe the system qualitatively correctly. Overall, this new type of functionals show good promise of overcoming some of the difficulties DFT encounters for systems with strong nondynamic correlation.
Collapse
Affiliation(s)
- Fenglai Liu
- College of Chemistry, Beijing Normal University, Beijing 100875, People's Republic of China
| | | | | | | | | |
Collapse
|
8
|
Fedoseev G, Ioppolo S, Lamberts T, Zhen JF, Cuppen HM, Linnartz H. Efficient surface formation route of interstellar hydroxylamine through NO hydrogenation. II. The multilayer regime in interstellar relevant ices. J Chem Phys 2012; 137:054714. [DOI: 10.1063/1.4738893] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
9
|
Proynov E, Liu F, Shao Y, Kong J. Improved self-consistent and resolution-of-identity approximated Becke'05 density functional model of nondynamic electron correlation. J Chem Phys 2012; 136:034102. [PMID: 22280739 PMCID: PMC3272064 DOI: 10.1063/1.3676726] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2011] [Accepted: 12/22/2011] [Indexed: 01/14/2023] Open
Abstract
In a recent letter [E. Proynov, Y. Shao, and J. Kong, Chem. Phys. Lett. 493, 381 (2010)], Becke's B05 model of nondynamic electron correlation in density functional theory was implemented self-consistently with computational efficiency (the "SCF-RI-B05" scheme). Important modifications of the algorithm were done in order to make the self-consistency feasible. In the present work, we give a complete account of the SCF-RI-B05 algorithm, including all the formulae for the analytical representation of the B05 functional and for its self-consistent field (SCF) potential. The average performance of the SCF-RI-B05 method reported in the above letter was somewhat less accurate, compared to the original B05 implementation, mainly because the parameters of the original B05 model were optimized with post-local-spin-density calculations. In this work, we report improved atomization energies with SCF-RI-B05, based on a SCF re-optimization of its four linear parameters. The re-optimized SCF-RI-B05 scheme is validated also on reaction barriers, and on the subtle energetics of NO dimer, an exemplary system of strong nondynamic correlation. It yields both the binding energy and the singlet-triplet splitting of the NO dimer correctly, and close to the benchmarks reported in the literature.
Collapse
Affiliation(s)
- Emil Proynov
- Q-Chem Inc., 5001 Baum Boulevard, Suite 690, Pittsburgh, Pennsylvania 15213, USA
| | | | | | | |
Collapse
|
10
|
Diri K, Krylov AI. Electronic States of the Benzene Dimer: A Simple Case of Complexity. J Phys Chem A 2011; 116:653-62. [DOI: 10.1021/jp209190e] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Kadir Diri
- Department of Chemistry, University of Southern California, Los Angeles, California 90089-0482, United States
| | - Anna I. Krylov
- Department of Chemistry, University of Southern California, Los Angeles, California 90089-0482, United States
| |
Collapse
|
11
|
Rau NJ, Wenthold PG. Experimental investigation of the absolute enthalpies of formation of 2,3-, 2,4-, and 3,4-pyridynes. J Phys Chem A 2011; 115:10353-62. [PMID: 21812461 DOI: 10.1021/jp2051068] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The absolute enthalpies of formation of 3,4-, 2,3-, and/or 2,4-didehydropyridines (3,4-, 2,3- and 2,4-pyridynes) have been determined by using energy-resolved collision-induced dissociation of deprotonated 2- and 3-chloropyridines. Bracketing experiments find the gas-phase acidities of 2- and 3-chloropyridines to be 383 ± 2 and 378 ± 2 kcal/mol, respectively. Whereas deprotonation of 3-chloropyridine leads to formation of a single ion isomer, deprotonation of the 2-chloro isomer results in a nearly 60:40 mixture of regioisomers. The enthalpy of formation of 3,4-pyridyne is measured to be 121 ± 3 kcal/mol by using the chloride dissociation energy for deprotonated 3-chloropyridine. The structure of the product formed upon dissociation of the ion from 2-chloropyridine cannot be unequivocally assigned because of the isomeric mixture of reactant ions and the fact that the potential neutral products (2,3-pyridyne and 2,4-pyridyne) are predicted by high level spin-flip coupled-cluster calculations to be nearly the same in energy. Consequently, the enthalpies of formation for both neutral products are assigned to be 130 ± 3 kcal/mol. Comparison of the enthalpies of dehydrogenation of benzene and pyridine indicates that the nitrogen in the pyridine ring does not have any effect on the stability of the aryne triple bond in 3,4-pyridyne, destabilizes the aryne triple bond in 2,3-pyridyne, and stabilizes the 1,3-interaction in 2,4-pyridyne compared to that in m-benzyne. Natural bond order calculations show that the effects on the 2,3- and 2,4-pyridynes result from polarization of the electrons caused by interaction with the lone pair. The polarization in 2,4-pyridyne is stabilizing because it creates a 1,2-interaction between the nitrogen and dehydrocarbons that is stronger than the 1,3-interaction between the dehydrocarbons.
Collapse
Affiliation(s)
- Nathan J Rau
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084, USA
| | | |
Collapse
|
12
|
Halvick P, Stoecklin T, Lique F, Hochlaf M. Explicitly correlated treatment of the Ar–NO+ cation. J Chem Phys 2011; 135:044312. [PMID: 21806124 DOI: 10.1063/1.3614502] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Philippe Halvick
- Institut des Sciences Moléculaires, Université de Bordeaux, CNRS UMR 5255, 33405 Talence Cedex, France.
| | | | | | | |
Collapse
|
13
|
Goebbert DJ, Pichugin K, Khuseynov D, Wenthold PG, Sanov A. Photoelectron imaging of NCCCN(-): The triplet ground state and the singlet-triplet splitting of dicyanocarbene. J Chem Phys 2010; 132:224301. [PMID: 20550391 DOI: 10.1063/1.3436717] [Citation(s) in RCA: 10] [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 photoelectron spectra of NCCCN(-) have been measured at 355 and 266 nm by means of photoelectron imaging. The spectra show two distinct features, corresponding to the ground and first excited states of dycianocarbene. With support from theoretical calculations using the spin-flip coupled-cluster methods, the ground electronic state of HCCCN is assigned as a triplet state, while the first excited state is a closed-shell singlet. The photoelectron band corresponding to the triplet is broad and congested, indicating a large geometry change between the anion and neutral. A single sharp feature of the singlet band suggests that the geometry of the excited neutral is similar to that of the anion. In agreement with these observations, theoretical calculations show that the neutral triplet state is either linear or quasilinear (X (3)B(1) or (3)Sigma(g) (-)), while the closed-shell singlet (a (1)A(1)) geometry is strongly bent, similar to the anion structure. The adiabatic electron binding energy of the closed-shell singlet is measured to be 3.72+/-0.02 eV. The best estimate of the origin of the triplet band gives an experimental upper bound of the adiabatic electron affinity of NCCCN, EA</=3.25+/-0.05 eV, while the Franck-Condon modeling yields an estimate of EA(NCCCN)=3.20+/-0.05 eV. From these results, the singlet-triplet splitting is estimated to be DeltaE(ST)(X (3)B(1)/(3)Sigma(g) (-)-a (1)A(1))=0.52+/-0.05 eV (12.0+/-1.2 kcal/mol).
Collapse
Affiliation(s)
- Daniel J Goebbert
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 84721, USA
| | | | | | | | | |
Collapse
|
14
|
Proynov E, Shao Y, Kong J. Efficient self-consistent DFT calculation of nondynamic correlation based on the B05 method. Chem Phys Lett 2010; 493:381-385. [PMID: 20640046 DOI: 10.1016/j.cplett.2010.05.029] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Becke's B05 method of describing nondynamic electron correlation in Density Functional Theory is implemented self-consistently with computational efficiency. Important modifications of the method are proposed in order to make the self-consistency feasible. Resolution-of-identity technique is used to reduce dramatically the cost of the required exact-exchange energy density. The method is briefly validated on a variety of properties. It describes accurately for the first time the subtle energetics of the NO dimer, an exemplary system of strong nondynamic correlation. The efficient algorithm for the exact-exchange energy density can be applied to other functionals that use this quantity.
Collapse
Affiliation(s)
- Emil Proynov
- Q-Chem Inc., 5001 Baum boulevard, Suite 690, Pittsburgh, PA 15213, USA
| | | | | |
Collapse
|
15
|
Marouani S, Bahri M, Batis H, Hochlaf M. Reactivity of the NO dimer: on the role of the triplet electronic states. J Phys Chem A 2010; 114:3025-30. [PMID: 19743862 DOI: 10.1021/jp905994u] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We performed ab initio calculations to investigate the lowest triplet and singlet electronic states of the NO dimer and their mutual spin-orbit couplings. The electronic structure calculations are done using multiconfigurational approaches and a large diffuse basis set. A high density of electronic states is found favoring their mutual interactions by vibronic and spin-orbit couplings. We used our potential curves and spin-orbit couplings to discuss the mechanisms for the IR dissociation and the UV photodissociation of the NO dimer and the electronic de-excitation of NO (A(2)Sigma(+)) after collision with NO (X(2)Pi). For these reactions, multistep pathways, which involve the long-range and the molecular regions of the potential energy surfaces of the triplet and singlet electronic states of N(2)O(2), are suggested. A qualitative agreement between our findings and previous experimental assumptions is found.
Collapse
Affiliation(s)
- S Marouani
- Laboratoire de Spectroscopie Atomique, Moléculaire et Application, Faculté des sciences de Tunis, Département de Physique, Université Tunis El Manar, 1060 Tunis, Tunisia
| | | | | | | |
Collapse
|
16
|
Ndome H, Hochlaf M. Ionospheric chemistry: Theoretical treatment of ONOO+ and of NO3+. J Chem Phys 2009; 130:204301. [DOI: 10.1063/1.3141508] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
17
|
Abstract
Photofragment spectroscopy is combined with imaging techniques and time-resolved measurements of photoions and photoelectrons to explore the predissociation dynamics of weakly bound molecules. Recent experimental advances include measurements of pair-correlated distributions, in which energy disposal in one cofragment is correlated with a state-selected level of the other fragment, and femtosecond pump-probe experiments, in some cases with coincidence detection. An application in which coincident measurements are carried out in the molecular frame is also described. To illustrate these state-selective and time-resolved techniques, we review two recent applications: (a) the photoinitiated dissociation of the covalently bound NO dimer on the ground and excited electronic states and the role of state couplings and (b) the state-selected vibrational predissociation of hydrogen-bonded acetylene dimers with HCl (acid) and ammonia (base) and the importance of angular momentum constraints. We highlight the crucial role of theoretical models in interpreting results.
Collapse
Affiliation(s)
- Hanna Reisler
- Department of Chemistry, University of Southern California, Los Angeles, California 90089-0482
| |
Collapse
|
18
|
Kim KH, Watanabe K, Menzel D, Freund HJ. Photoinduced Abstraction Reactions within NO Dimers on Ag(111). J Am Chem Soc 2009; 131:1660-1. [DOI: 10.1021/ja808615m] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ki Hyun Kim
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany, and Physik-Department E20, Technische Universität München, 85748 Garching, Germany
| | - Kazuo Watanabe
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany, and Physik-Department E20, Technische Universität München, 85748 Garching, Germany
| | - Dietrich Menzel
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany, and Physik-Department E20, Technische Universität München, 85748 Garching, Germany
| | - Hans-Joachim Freund
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany, and Physik-Department E20, Technische Universität München, 85748 Garching, Germany
| |
Collapse
|
19
|
Krylov AI. Equation-of-motion coupled-cluster methods for open-shell and electronically excited species: the Hitchhiker's guide to Fock space. Annu Rev Phys Chem 2008; 59:433-62. [PMID: 18173379 DOI: 10.1146/annurev.physchem.59.032607.093602] [Citation(s) in RCA: 734] [Impact Index Per Article: 45.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The equation-of-motion coupled-cluster (EOM-CC) approach is a versatile electronic-structure tool that allows one to describe a variety of multiconfigurational wave functions within single-reference formalism. This review provides a guide to established EOM methods illustrated by examples that demonstrate the types of target states currently accessible by EOM. It focuses on applications of EOM-CC to electronically excited and open-shell species. The examples emphasize EOM's advantages for selected situations often perceived as multireference cases [e.g., interacting states of different nature, Jahn-Teller (JT) and pseudo-JT states, dense manifolds of ionized states, diradicals, and triradicals]. I also discuss limitations and caveats and offer practical solutions to some problematic situations. The review also touches on some formal aspects of the theory and important current developments.
Collapse
Affiliation(s)
- Anna I Krylov
- Department of Chemistry, University of Southern California, Los Angeles, California 90089-0482, USA.
| |
Collapse
|
20
|
Shi H, Roettger DC, East ALL. Photochemistry studied with ab initio orbital-correlation and state-correlation plots: Classic cyclobutene ring opening, and the reaction of N2 with photoexcited O2. J Comput Chem 2008; 29:883-91. [PMID: 17963232 DOI: 10.1002/jcc.20843] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Pericyclic reaction theory arose from ideas presented in 1965, based on orbital-energy correlation diagrams (Woodward and Hoffmann) and state-energy correlation diagrams (Longuet-Higgins and Abrahamson). Here we have used ab initio complete-active-space self-consistent field (CASSCF) calculations to generate such diagrams. First we present diagrams for the classic case of cyclobutene ring opening, to demonstrate agreement between the CASSCF results and the classic diagrams of both Woodward/Hoffmann and Longuet-Higgins/Abrahamson. Then we present diagrams for the more difficult cases of N(2) + photoexcited O(2), to produce either 2 NO or NNO + O. These N(2) + O(2) cases feature significant electron reorganization, for which elementary pencil-and-paper diagrams are less accurate. Finally, the benefits and limitations of such diagrams for predicting photochemistry are briefly discussed.
Collapse
Affiliation(s)
- Huancong Shi
- Department of Chemistry and Biochemistry, University of Regina, Regina, Saskatchewan S4S 0A2, Canada
| | | | | |
Collapse
|
21
|
Stolow A, Underwood JG. Time-Resolved Photoelectron Spectroscopy of Nonadiabatic Dynamics in Polyatomic Molecules. ADVANCES IN CHEMICAL PHYSICS 2008. [DOI: 10.1002/9780470259498.ch6] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
|
22
|
|
23
|
Taguchi N, Mochizuki Y, Ishikawa T, Tanaka K. Multi-reference calculations of nitric oxide dimer. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2007.11.084] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
24
|
Melania Oana C, Krylov AI. Dyson orbitals for ionization from the ground and electronically excited states within equation-of-motion coupled-cluster formalism: Theory, implementation, and examples. J Chem Phys 2007; 127:234106. [DOI: 10.1063/1.2805393] [Citation(s) in RCA: 209] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|