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Wang L, Lam CS, Chhantyal-Pun R, Brynteson MD, Butler LJ, Miller TA. Imaging and Scattering Studies of the Unimolecular Dissociation of the BrCH2CH2O Radical from BrCH2CH2ONO Photolysis at 351 nm. J Phys Chem A 2014; 118:404-16. [DOI: 10.1021/jp4095886] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lei Wang
- The James Franck Institute and Department
of Chemistry, The University of Chicago, Chicago, Illinois 60637 United States and
| | - Chow-Shing Lam
- The James Franck Institute and Department
of Chemistry, The University of Chicago, Chicago, Illinois 60637 United States and
| | - Rabi Chhantyal-Pun
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210 United States
| | - Matthew D. Brynteson
- The James Franck Institute and Department
of Chemistry, The University of Chicago, Chicago, Illinois 60637 United States and
| | - Laurie J. Butler
- The James Franck Institute and Department
of Chemistry, The University of Chicago, Chicago, Illinois 60637 United States and
| | - Terry A. Miller
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210 United States
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2
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Chhantyal-Pun R, Chen MW, Sun D, Miller TA. Detection and Characterization of Products from Photodissociation of XCH2CH2ONO (X = F, Cl, Br, OH). J Phys Chem A 2012. [PMID: 23185987 DOI: 10.1021/jp308428a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rabi Chhantyal-Pun
- Department of Chemistry, The Ohio State University, 120 West 18th Avenue, Columbus Ohio 43210,
United States
| | - Ming-Wei Chen
- Department of Chemistry, The Ohio State University, 120 West 18th Avenue, Columbus Ohio 43210,
United States
| | - Dianping Sun
- Department of Chemistry, The Ohio State University, 120 West 18th Avenue, Columbus Ohio 43210,
United States
| | - Terry A. Miller
- Department of Chemistry, The Ohio State University, 120 West 18th Avenue, Columbus Ohio 43210,
United States
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3
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Wenge AM, Schmaunz A, Kensy U, Dick B. Photodissociation dynamics of tert-butylnitrite following excitation to the S1 and S2 states. A study by velocity-map ion-imaging and 3D-REMPI spectroscopy. Phys Chem Chem Phys 2012; 14:7076-89. [DOI: 10.1039/c2cp40349h] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Rosenberg M, Minitti MP, Rusteika N, Bisgaard CZ, Deb S, Weber PM, Sølling TI. Probing the Lifetimes of Internally Excited Amyl Nitrite Cations. J Phys Chem A 2010; 114:7021-5. [DOI: 10.1021/jp102393g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Martin Rosenberg
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, and Department of Chemistry, Brown University, Providence, Rhode Island 02912
| | - Michael P. Minitti
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, and Department of Chemistry, Brown University, Providence, Rhode Island 02912
| | - Nerijus Rusteika
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, and Department of Chemistry, Brown University, Providence, Rhode Island 02912
| | - Christer Z. Bisgaard
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, and Department of Chemistry, Brown University, Providence, Rhode Island 02912
| | - Sanghamitra Deb
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, and Department of Chemistry, Brown University, Providence, Rhode Island 02912
| | - Peter M. Weber
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, and Department of Chemistry, Brown University, Providence, Rhode Island 02912
| | - Theis I. Sølling
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, and Department of Chemistry, Brown University, Providence, Rhode Island 02912
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5
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Theoretical study of the conformers of n-butyl nitrite and their dissociation pathways leading to OH formation. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.09.055] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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6
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Yue XF, Sun JL, Yin HM, Wei Q, Han KL. Photodissociation Dynamics of Alkyl Nitrites at 266 and 355 nm: The OH Product Channel. J Phys Chem A 2009; 113:3303-10. [DOI: 10.1021/jp810731d] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xian-Fang Yue
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Ju-Long Sun
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Hong-Ming Yin
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Qiang Wei
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Ke-Li Han
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
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Küpper J, Filsinger F, Meijer G. Manipulating the motion of large neutral molecules. Faraday Discuss 2009; 142:155-73; discussion 221-55. [DOI: 10.1039/b820045a] [Citation(s) in RCA: 25] [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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8
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Kong W, Pei L, Zhang J. Linear dichroism spectroscopy of gas phase biological molecules embedded in superfluid helium droplets. INT REV PHYS CHEM 2009. [DOI: 10.1080/01442350802573678] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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9
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Polarization spectroscopy of aluminum phthalocyanine hydroxide embedded in superfluid helium droplets. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.07.109] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Photodissociation dynamics of n-butyl nitrite at 266nm: Internal state distributions of nascent NO fragments. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2007.12.025] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Pei L, Zhang J, Kong W. Electronic polarization spectroscopy of metal phthalocyanine chloride compounds in superfluid helium droplets. J Chem Phys 2008; 127:174308. [PMID: 17994819 DOI: 10.1063/1.2803186] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report the electronic polarization spectroscopy of two metal phthalocyanine chloride compounds (MPcCl, M=Al,Ga) embedded in superfluid helium droplets and oriented in a dc electric field. For both compounds, the laser induced fluorescence spectra show preference for perpendicular excitation relative to the orientation field. This result indicates that the permanent dipoles of both compounds are predominantly perpendicular to the transition dipole. Since the permanent dipole derives from the metal chloride, while the transition dipole derives from the phthalocyanine chromophore, in the plane of phthalocyanine, this qualitative result is not surprising. However, quantitative modeling reveals that this intuitive model is inadequate and that the transition dipole might have tilted away from the molecular plane of phthalocyanine. The out of plane component of the transition dipole amounts to approximately 10% if the permanent dipole is assumed to be approximately 4 debye. The origin for this tilt is puzzling, and we tentatively attribute it to the transition of nonbonding orbitals, either from the chlorine atom or from the bridge nitrogen atom, to the pi* orbitals of the phthalocyanine chromophore. On the other hand, although unlikely, we cannot completely exclude the possibility that both our high level density functional theory calculation and ab initio results severely deviate from reality. The droplet matrix induces redshifts in the origin of the electronic transition and produces discrete phonon wings. Nevertheless, in dc electric fields, all phonon wings and the zero phonon line demonstrate the same dependence on the polarization direction of the excitation laser. Although electronic excitation does couple to the superfluid helium matrix and the resulting phonon wings add complications to the electronic spectrum, this coupling does not affect the direction of the electronic transition dipole. Electronic polarization spectroscopy in superfluid helium droplets is thus still informative in revealing the permanent dipole and its relation relative to the transition dipole.
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Affiliation(s)
- Linsen Pei
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331-4003, USA
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12
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Pei L, Zhang J, Wu C, Kong W. Conformational identification of tryptamine embedded in superfluid helium droplets using electronic polarization spectroscopy. J Chem Phys 2006; 125:24305. [PMID: 16848582 DOI: 10.1063/1.2217948] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report electronic polarization spectroscopy of tryptamine embedded in superfluid helium droplets. In a dc electric field, dependence of laser induced fluorescence from tryptamine on the polarization direction of the excitation laser is measured. Among the three observed major conformers A, D, and E, conformers D and E display preference for perpendicular excitation relative to the orientation field, while conformer A is insensitive to the polarization direction of the excitation laser. We attribute the behavior of conformer A to the fact that the angle between the permanent dipole and the transition dipole is close to the magic angle. Using a linear variation method, we can reproduce the polarization preference of the three conformers and determine the angle between the transition dipole and the permanent dipole. Since the side chain exerts small effect on the direction of the transition dipole in the frame of the indole chromophore, all three conformers have a common transition dipole more or less in the indole plane at an angle of approximately 60 degrees relative to the long axis of the chromophore. The orientation of the side chain, on the other hand, determines the size and direction of the permanent dipole, thereby affecting the angle between the permanent dipole and the transition dipole. For conformer D in the droplet, our results agree with the Anti(ph) structure, rather than the Anti(py) structure. Our work demonstrates that polarization spectroscopy is effective in conformational identification for molecules that contain a known chromophore. Although coupling of the electronic transition with the helium matrix is not negligible, it does not affect the direction of the transition dipole.
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Affiliation(s)
- Linsen Pei
- Department of Chemistry, Oregon State University, Corvallis, OR 97331, USA
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13
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Kanya R, Ohshima Y. Pendular-state spectroscopy of the S1–S0 electronic transition of 9-cyanoanthracene. J Chem Phys 2004; 121:9489-97. [PMID: 15538870 DOI: 10.1063/1.1806420] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Fluorescence excitation spectra of the S(1)-S(0) origin band of 9-cyanoanthracene have been observed under a uniform electric field up to 200 kV/cm to explore pendular-state spectrum of an asymmetric-top molecule close to the strong field limit. The observed spectra exhibit distinct evolution of the band contour as a function of the applied electric field, which are much different from each other for different excitation configurations. An approximate method suitable for spectrum simulations of large asymmetric-top molecules in a pendular condition is developed for the analysis of the experimental results. The comparison of the observed and simulated spectra shows that the spectra are well ascribed in terms of the pendular-state selection rules, which have recently been derived from theoretical consideration of the pendular-limit representation of energy levels and spectra.
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Affiliation(s)
- Reika Kanya
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
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14
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Douberly GE, Miller RE. The Growth of HF Polymers in Helium Nanodroplets: Probing the Barriers to Ring Insertion. J Phys Chem B 2003. [DOI: 10.1021/jp022360+] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Jia B, Laib J, Lobo RFM, Brooks PR. Evidence for orbital-specific electron transfer to oriented haloform molecules. J Am Chem Soc 2002; 124:13896-902. [PMID: 12431121 DOI: 10.1021/ja027710k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Beams of hyperthermal K atoms cross beams of the oriented haloforms CF(3)H, CCl(3)H, and CBr(3)H, and transfer of an electron mainly produces K(+) and the X(-) halide ion which are detected in coincidence. As expected, the steric asymmetry of CCl(3)H and CBr(3)H is very small and the halogen end is more reactive. However, even though there are three potentially reactive centers on each molecule, the F(-) ion yield in CF(3)H is strongly dependent on orientation. At energies close to the threshold for ion-pair formation ( approximately 5.5 eV), H-end attack is more reactive to form F(-). As the energy is increased, the more productive end switches, and F-end attack dominates the reactivity. In CF(3)H near threshold the electron is apparently transferred to the sigma(CH) antibonding orbital, and small signals are observed from electrons and CF(3)(-) ions, indicating "activation" of this orbital. In CCl(3)H and CBr(3)H the steric asymmetry is very small, and signals from free electrons and CX(3)(-) ions are barely detectable, indicating that the sigma(CH) antibonding orbital is not activated. The electron is apparently transferred to the sigma(CX) orbital which is believed to be the LUMO. At very low energies the proximity of the incipient ions probably determines whether salt molecules or ions are formed.
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Affiliation(s)
- Beike Jia
- Chemistry Department and Rice Quantum Institute, Rice University, Houston, Texas 77251, USA
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16
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Abbott JE, Peng X, Kong W. Symmetry properties of electronically excited states of nitroaromatic compounds. J Chem Phys 2002. [DOI: 10.1063/1.1513992] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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17
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Brooks PR, Harris SA. Frontside versus backside reactivity in electron transfer to orientedtertbutyl bromide and methyl bromide. J Chem Phys 2002. [DOI: 10.1063/1.1496477] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [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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Poulsen MD, Skovsen E, Stapelfeldt H. Photodissociation of laser aligned iodobenzene: Towards selective photoexcitation. J Chem Phys 2002. [DOI: 10.1063/1.1489901] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Castle KJ, Abbott JE, Peng X, Kong W. Photodissociation of o-Nitrotoluene between 220 and 250 nm in a Uniform Electric Field. J Phys Chem A 2000. [DOI: 10.1021/jp0009150] [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]
Affiliation(s)
- Karen J. Castle
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331-4003
| | - James E. Abbott
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331-4003
| | - Xianzhao Peng
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331-4003
| | - Wei Kong
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331-4003
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