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Smith JM, Nikow M, Wilhelm MJ, Dai HL. Collisional Relaxation of Highly Vibrationally Excited Acetylene Mediated by the Vinylidene Isomer. J Phys Chem A 2023; 127:8782-8793. [PMID: 37846886 DOI: 10.1021/acs.jpca.3c03656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2023]
Abstract
Collisional relaxation of highly vibrationally excited acetylene, generated from the 193 nm photolysis of vinyl bromide with roughly 23,000 cm-1 of nascent vibrational energy, is studied via submicrosecond time-resolved Fourier transform infrared (FTIR) emission spectroscopy. IR emission from vibrationally hot acetylene during collisional relaxation by helium, neon, argon, and krypton rare-gas colliders is recorded and analyzed to deduce the acetylene energy content as a function of time. The average energy lost per collision, ⟨ΔE⟩, is computed using the Lennard-Jones collision frequency. Two distinct vibrational-to-translational (V-T) energy transfer regimes in terms of the acetylene energy are identified. At vibrational energies below 10,000-14,000 cm-1, energy transfer efficiency increases linearly with molecular energy content and is in line with typical V-T behavior in quantity. In contrast, above 10,000-14,000 cm-1, the V-T energy transfer efficiency displays a dramatic and rapid increase. This increase is nearly coincident with the acetylene-vinylidene isomerization limit, which occurs nearly 15,000 cm-1 above the acetylene zero-point energy. Combined quasi-classical trajectory calculations and Schwartz-Slawsky-Herzfeld-Tanczos theory point to a vinylidene contribution being responsible for the large enhancement. This observation illustrates the influence of energetically accessible structural isomers to greatly enhance the energy transfer rates of highly vibrationally excited molecules.
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Affiliation(s)
- Jonathan M Smith
- Department of Chemistry, Temple University, 1901 N. 13th. Street, Philadelphia, Pennsylvania 19122, United States
- Hylleraas Institute, Department of Chemistry, University of Oslo, Oslo 0313, Norway
| | - Matthew Nikow
- Department of Chemistry, Temple University, 1901 N. 13th. Street, Philadelphia, Pennsylvania 19122, United States
| | - Michael J Wilhelm
- Department of Chemistry, Temple University, 1901 N. 13th. Street, Philadelphia, Pennsylvania 19122, United States
| | - Hai-Lung Dai
- Department of Chemistry, Temple University, 1901 N. 13th. Street, Philadelphia, Pennsylvania 19122, United States
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2
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Accurate Quantum Dynamics of the Simplest Isomerization System Involving Double-H Transfer. CHINESE J CHEM PHYS 2022. [DOI: 10.1063/1674-0068/cjcp2112268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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3
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Hu CL, Wang J, Hua TP, Liu AW, Sun YR, Hu SM. Comb-locked cavity-assisted double-resonance molecular spectroscopy based on diode lasers. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2021; 92:073003. [PMID: 34340416 DOI: 10.1063/5.0054592] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 06/26/2021] [Indexed: 06/13/2023]
Abstract
Interactions between a molecule and two or more laser fields are of great interest in various studies, but weak and highly overlapping transitions hinder precision measurements. We present the method of comb-locked cavity-assisted double resonance spectroscopy based on narrow-linewidth continuous-wave lasers, which allows for state-selective pumping and probing of molecules. By locking two near-infrared diode lasers to one cavity with a finesse at the order of 105, we measured all three types of double resonances. Carbon monoxide molecules with selected speeds along the laser beam were excited to vibrationally excited states, and absorption spectra with sub-MHz linewidths were observed. Positions of double resonance transitions were determined with an accuracy of 3.7 kHz, which was verified by comparing to Lamb-dip measurements. The present work paves the way to the pump-probe study of highly excited molecules with unprecedented precision.
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Affiliation(s)
- C-L Hu
- Hefei National Laboratory for Physical Sciences at Microscale, iChem Center, University of Science and Technology of China, Hefei 230026, China
| | - J Wang
- Hefei National Laboratory for Physical Sciences at Microscale, iChem Center, University of Science and Technology of China, Hefei 230026, China
| | - T-P Hua
- Hefei National Laboratory for Physical Sciences at Microscale, iChem Center, University of Science and Technology of China, Hefei 230026, China
| | - A-W Liu
- Hefei National Laboratory for Physical Sciences at Microscale, iChem Center, University of Science and Technology of China, Hefei 230026, China
| | - Y R Sun
- Hefei National Laboratory for Physical Sciences at Microscale, iChem Center, University of Science and Technology of China, Hefei 230026, China
| | - S-M Hu
- Hefei National Laboratory for Physical Sciences at Microscale, iChem Center, University of Science and Technology of China, Hefei 230026, China
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4
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Luo J, Cao J, Liu H, Bian W. Accurate quantum mechanical calculations on deuterated vinylidene isomerization. J Chem Phys 2020; 153:054309. [DOI: 10.1063/5.0015470] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Affiliation(s)
- Jia Luo
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jianwei Cao
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Hao Liu
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wensheng Bian
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
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5
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Orr BJ. Collision-induced rovibrational energy transfer in small polyatomic molecules: the role of intramolecular perturbations. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1490463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Brian J. Orr
- Department of Physics and Astronomy, MQ Photonics Research Centre, Macquarie University, Sydney, Australia
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6
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Karhu J, Nauta J, Vainio M, Metsälä M, Hoekstra S, Halonen L. Double resonant absorption measurement of acetylene symmetric vibrational states probed with cavity ring down spectroscopy. J Chem Phys 2016; 144:244201. [DOI: 10.1063/1.4954159] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- J. Karhu
- Laboratory of Physical Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014 Helsinki, Finland
| | - J. Nauta
- Van Swinderen Institute for Particle Physics and Gravity, University of Groningen, Nijenborgh 4, 9747 AG Groningen, Netherlands
| | - M. Vainio
- Laboratory of Physical Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014 Helsinki, Finland
- VTT Technical Research Centre of Finland Ltd., Centre of Metrology MIKES, P.O. Box 1000, Espoo FI-02044 VTT, Finland
| | - M. Metsälä
- Laboratory of Physical Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014 Helsinki, Finland
| | - S. Hoekstra
- Van Swinderen Institute for Particle Physics and Gravity, University of Groningen, Nijenborgh 4, 9747 AG Groningen, Netherlands
| | - L. Halonen
- Laboratory of Physical Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014 Helsinki, Finland
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7
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Ren Y, Bian W. Mode-Specific Tunneling Splittings for a Sequential Double-Hydrogen Transfer Case: An Accurate Quantum Mechanical Scheme. J Phys Chem Lett 2015; 6:1824-1829. [PMID: 26263255 DOI: 10.1021/acs.jpclett.5b00672] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We present the first accurate quantum dynamics calculations of mode-specific tunneling splittings in a sequential double-hydrogen transfer process. This is achieved in the vinylidene-acetylene system, the simplest molecular system of this kind, and by large-scale parallel computations with an efficient theoretical scheme developed by us. In our scheme, basis functions are customized for the hydrogen transfer process; a 4-dimensional basis contraction strategy is combined with the preconditioned inexact spectral transform method; efficient parallel implementation is achieved. Mode-specific permutation tunneling splittings of vinylidene states are reported and tremendous mode-specific promotion effects are revealed; in particular, the CH2 rock mode enhances the ground-state splitting by a factor of 10(3). We find that the ground-state vinylidene has a reversible-isomerization time of 622 ps, much longer than all previous estimates. Our calculations also shed light on the importance of the deep intermediate well and vibrational excitation in the double-hydrogen transfer processes.
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Affiliation(s)
- Yinghui Ren
- †Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- ‡University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wensheng Bian
- †Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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8
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Orr BJ. Spectroscopy and energetics of the acetylene molecule: dynamical complexity alongside structural simplicity. INT REV PHYS CHEM 2010. [DOI: 10.1080/01442350600892577] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Brian J. Orr
- a Department of Physics and Centre for Lasers and Applications , Macquarie University , Sydney , NSW 2109 , Australia
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9
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Perry DS, Miller A, Amyay† B, Fayt A, Herman M. Vibration–rotation alchemy in acetylene (12C2H2), at low vibrational excitation: from high resolution spectroscopy to fast intramolecular dynamics. Mol Phys 2010. [DOI: 10.1080/00268971003660874] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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10
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Nikow M, Wilhelm MJ, Smith JM, Dai HL. Strong combination-band IR emission from highly vibrationally excited acetylene. Phys Chem Chem Phys 2010; 12:2915-22. [DOI: 10.1039/b918211j] [Citation(s) in RCA: 13] [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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11
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Payne MA, Milce AP, Frost MJ, Orr BJ. Rovibrational Energy Transfer in the 4νCH Manifold of Acetylene, Viewed by IR-UV Double Resonance Spectroscopy. 3. State-to-State J-Resolved Kinetics. ACTA ACUST UNITED AC 2009. [DOI: 10.1524/zpch.219.5.601.64327] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
Time-resolved infrared-ultraviolet double resonance (IR-UV DR) spectroscopy is used to study the kinetics of collision-induced state-to-state molecular energy transfer between rovibrational states in the 12700-cm−1 4νCH manifold of the electronic ground state of acetylene (C2H2). Particular initial and final rovibrational J-states are prepared and monitored by a pair of tunable laser pulses (IR PUMP and UV PROBE) and the kinetic results recorded by continuously varying the time delay between those pulses at a set sample pressure. After allowing for collision-induced quenching of fluorescence and mass transfer from the IR-UV optical excitation zone (by beam flyout and diffusion), an array of kinetic data for J-resolved energy-transfer channels can be interpreted by means of a mechanistically structured master-equation model. This paper focuses on kinetics derived by probing C2H2 in its 4νCH
J = 12 state (which is affected by intramolecular perturbations and implicated in unusual collision-induced quasi-continuous background effects) and J-resolved collision-induced rovibrational energy transfer with both even ΔJ and (supposedly forbidden) odd ΔJ.
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12
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Robert S, Amyay B, Fayt A, Di Lonardo G, Fusina L, Tamassia F, Herman M. Vibration−Rotation Energy Pattern in Acetylene: 13CH12CH up to 10 120 cm−1. J Phys Chem A 2009; 113:13251-9. [DOI: 10.1021/jp904000q] [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)
- S. Robert
- Service de Chimie Quantique et Photophysique CP160/09, Faculté des Sciences, Université Libre de Bruxelles, Av. Roosevelt, 50, B-1050 Bruxelles, Belgium, Laboratoire de Spectroscopie Moléculaire, Université Catholique de Louvain, Chemin du Cyclotron, 2, B-1348 Louvain-La-Neuve, Belgium, and Dipartimento di Chimica Fisica e Inorganica, Università di Bologna, Viale Risorgimento, 4, I-40136 Bologna, Italy
| | - B. Amyay
- Service de Chimie Quantique et Photophysique CP160/09, Faculté des Sciences, Université Libre de Bruxelles, Av. Roosevelt, 50, B-1050 Bruxelles, Belgium, Laboratoire de Spectroscopie Moléculaire, Université Catholique de Louvain, Chemin du Cyclotron, 2, B-1348 Louvain-La-Neuve, Belgium, and Dipartimento di Chimica Fisica e Inorganica, Università di Bologna, Viale Risorgimento, 4, I-40136 Bologna, Italy
| | - A. Fayt
- Service de Chimie Quantique et Photophysique CP160/09, Faculté des Sciences, Université Libre de Bruxelles, Av. Roosevelt, 50, B-1050 Bruxelles, Belgium, Laboratoire de Spectroscopie Moléculaire, Université Catholique de Louvain, Chemin du Cyclotron, 2, B-1348 Louvain-La-Neuve, Belgium, and Dipartimento di Chimica Fisica e Inorganica, Università di Bologna, Viale Risorgimento, 4, I-40136 Bologna, Italy
| | - G. Di Lonardo
- Service de Chimie Quantique et Photophysique CP160/09, Faculté des Sciences, Université Libre de Bruxelles, Av. Roosevelt, 50, B-1050 Bruxelles, Belgium, Laboratoire de Spectroscopie Moléculaire, Université Catholique de Louvain, Chemin du Cyclotron, 2, B-1348 Louvain-La-Neuve, Belgium, and Dipartimento di Chimica Fisica e Inorganica, Università di Bologna, Viale Risorgimento, 4, I-40136 Bologna, Italy
| | - L. Fusina
- Service de Chimie Quantique et Photophysique CP160/09, Faculté des Sciences, Université Libre de Bruxelles, Av. Roosevelt, 50, B-1050 Bruxelles, Belgium, Laboratoire de Spectroscopie Moléculaire, Université Catholique de Louvain, Chemin du Cyclotron, 2, B-1348 Louvain-La-Neuve, Belgium, and Dipartimento di Chimica Fisica e Inorganica, Università di Bologna, Viale Risorgimento, 4, I-40136 Bologna, Italy
| | - F. Tamassia
- Service de Chimie Quantique et Photophysique CP160/09, Faculté des Sciences, Université Libre de Bruxelles, Av. Roosevelt, 50, B-1050 Bruxelles, Belgium, Laboratoire de Spectroscopie Moléculaire, Université Catholique de Louvain, Chemin du Cyclotron, 2, B-1348 Louvain-La-Neuve, Belgium, and Dipartimento di Chimica Fisica e Inorganica, Università di Bologna, Viale Risorgimento, 4, I-40136 Bologna, Italy
| | - M. Herman
- Service de Chimie Quantique et Photophysique CP160/09, Faculté des Sciences, Université Libre de Bruxelles, Av. Roosevelt, 50, B-1050 Bruxelles, Belgium, Laboratoire de Spectroscopie Moléculaire, Université Catholique de Louvain, Chemin du Cyclotron, 2, B-1348 Louvain-La-Neuve, Belgium, and Dipartimento di Chimica Fisica e Inorganica, Università di Bologna, Viale Risorgimento, 4, I-40136 Bologna, Italy
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13
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Dong F, Roberts M, Nesbitt DJ. High-resolution infrared spectroscopy of jet-cooled vinyl radical: Symmetric CH2 stretch excitation and tunneling dynamics. J Chem Phys 2008; 128:044305. [DOI: 10.1063/1.2816704] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
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14
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Payne MA, Milce AP, Frost MJ, Orr BJ. Rovibrational Energy Transfer in the 4νCH Manifold of Acetylene, Viewed by IR−UV Double Resonance Spectroscopy. 5. Detailed Kinetic Model. J Phys Chem A 2007; 111:12839-53. [DOI: 10.1021/jp0767617] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mark A. Payne
- Centre for Lasers and Applications, Macquarie University, Sydney, NSW 2109, Australia
| | - Angela P. Milce
- Centre for Lasers and Applications, Macquarie University, Sydney, NSW 2109, Australia
| | - Michael J. Frost
- Centre for Lasers and Applications, Macquarie University, Sydney, NSW 2109, Australia
| | - Brian J. Orr
- Centre for Lasers and Applications, Macquarie University, Sydney, NSW 2109, Australia
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15
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Payne MA, Milce AP, Frost MJ, Orr BJ. Rovibrational Energy Transfer in the 4νCH Manifold of Acetylene, Viewed by IR−UV Double-Resonance Spectroscopy. 4. Collision-Induced Quasi-Continuous Background Effects. J Phys Chem A 2006; 110:3307-19. [PMID: 16509657 DOI: 10.1021/jp055245i] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The 4nu(CH) rovibrational manifold around 12 700 cm(-1) in the electronic ground state, X, of acetylene (C2H2) is monitored by time-resolved infrared-ultraviolet double-resonance (IR-UV DR) spectroscopy. An IR laser pulse initially prepares rotational J states, associated with the "IR-bright" (nu1 + 3nu3) or (1 0 3 0 0)0 vibrational combination level, and subsequent collision-induced state-to-state energy transfer is probed by UV laser-induced fluorescence. Anharmonic, l-resonance, and Coriolis couplings affect the J states of interest, resulting in a congested rovibrational manifold that exhibits complex intramolecular dynamics. In preceding papers in this series, we have described three complementary forms of the IR-UV DR experiment (IR-scanned, UV-scanned, and kinetic) on collision-induced rovibrational satellites, comprising both regular even-DeltaJ features and unexpected odd-DeltaJ features. This paper examines an unusual collision-induced quasi-continuous background (CIQCB) effect that is apparently ubiquitous, accompanying regular even-DeltaJ rovibrational energy transfer and accounting for much of the observed collision-induced odd-DeltaJ satellite structure; certain IR-bright (1 0 3 0 0)0 rovibrational states (e.g., J = 12) are particularly prominent in this regard. We examine the mechanism of this CIQCB phenomenon in terms of a congested IR-dark rovibrational manifold that is populated by collisional transfer from the nearly isoenergetic IR-bright (1 0 3 0 0)0 submanifold.
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Affiliation(s)
- Mark A Payne
- Centre for Lasers and Applications, Macquarie University, Sydney, NSW 2109, Australia
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16
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Zyubina TS, Dyakov YA, Lin SH, Bandrauk AD, Mebel AM. Theoretical study of isomerization and dissociation of acetylene dication in the ground and excited electronic states. J Chem Phys 2005; 123:134320. [PMID: 16223301 DOI: 10.1063/1.2050649] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Ab initio calculations employing the configuration interaction method including Davidson's corrections for quadruple excitations have been carried out to unravel the dissociation mechanism of acetylene dication in various electronic states and to elucidate ultrafast acetylene-vinylidene isomerization recently observed experimentally. Both in the ground triplet and the lowest singlet electronic states of C2H2(2+) the proton migration barrier is shown to remain high, in the range of 50 kcal/mol. On the other hand, the barrier in the excited 2 3A" and 1 3A' states decreases to about 15 and 34 kcal/mol, respectively, indicating that the ultrafast proton migration is possible in these states, especially, in 2 3A", even at relatively low available vibrational energies. Rice-Ramsperger-Kassel-Marcus calculations of individual reaction-rate constants and product branching ratios indicate that if C2H(2)2+ dissociates from the ground triplet state, the major reaction products should be CCH+(3Sigma-)+H+ followed by CH+(3Pi)+CH+(1Sigma+) and with a minor contribution (approximately 1%) of C2H+(2A1)+C+(2P). In the lowest singlet state, C2H+(2A1)+C+(2P) are the major dissociation products at low available energies when the other channels are closed, whereas at Eint>5 eV, the CCH+(1A')+H+ products have the largest branching ratio, up to 70% and higher, that of CH+(1Sigma+)+CH+(1Sigma+) is in the range of 25%-27%, and the yield of C2H++C+ is only 2%-3%. The calculated product branching ratios at Eint approximately 17 eV are in qualitative agreement with the available experimental data. The appearance thresholds calculated for the CCH++H+, CH++CH+, and C2H++C+ products are 34.25, 35.12, and 34.55 eV. The results of calculations in the presence of strong electric field show that the field can make the vinylidene isomer unstable and the proton elimination spontaneous, but is unlikely to significantly reduce the barrier for the acetylene-vinylidene isomerization and to render the acetylene configuration unstable or metastable with respect to proton migration.
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Affiliation(s)
- T S Zyubina
- Institute of Atomic and Molecular Sciences, Academia Sinica, P. O. Box 23-166, Taipei 10764, Taiwan
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17
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Payne MA, Milce AP, Frost MJ, Orr BJ. Rovibrational Energy Transfer in the 4νCH Manifold of Acetylene Viewed by IR−UV Double Resonance Spectroscopy. 2. Perturbed States with J = 17 and 18. J Phys Chem B 2005; 109:8332-43. [PMID: 16851977 DOI: 10.1021/jp0463518] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Collision-induced state-to-state molecular energy transfer between rovibrational states in the 12,700 cm(-1) 4nu(CH) manifold of the electronic ground state X of acetylene (C(2)H(2)) is monitored by time-resolved infrared-ultraviolet double resonance (IR-UV DR) spectroscopy. Rotational J-states associated with the (nu(1) + 3nu(3)) or (1 0 3 0 0)(0) vibrational combination level, initially prepared by an IR pulse, are probed at approximately 299, approximately 296, or approximately 323 nm with UV laser-induced fluorescence via the Alpha electronic state. The rovibrational J-states of interest belong to a congested manifold that is affected by anharmonic, l-resonance, and Coriolis couplings, yielding complex intramolecular dynamics. Consequently, collision-induced rovibrational satellites observed by IR-UV DR comprise not only regular even-DeltaJ features but also supposedly forbidden odd-DeltaJ features. A preceding paper (J. Phys. Chem. A 2003, 107, 10759) focused on low-J-value rovibrational levels of the 4nu(CH) manifold (particularly those with J = 0 and J = 1) whereas this paper examines locally perturbed states at higher values of J (particularly J = 17 and 18, which display anomalous doublet structure in IR-absorption spectra). Three complementary forms of IR-UV DR experiments (IR-scanned, UV-scanned, and kinetic) are used to address the extent to which intramolecular perturbations influence the efficiency of J-resolved collision-induced energy transfer with both even and odd DeltaJ.
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Affiliation(s)
- Mark A Payne
- Centre for Lasers and Applications, Macquarie University, Sydney, New South Wales 2109, Australia
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18
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Osipov T, Cocke CL, Prior MH, Landers A, Weber T, Jagutzki O, Schmidt L, Schmidt-Böcking H, Dörner R. Photoelectron-photoion momentum spectroscopy as a clock for chemical rearrangements: isomerization of the di-cation of acetylene to the vinylidene configuration. PHYSICAL REVIEW LETTERS 2003; 90:233002. [PMID: 12857254 DOI: 10.1103/physrevlett.90.233002] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2002] [Indexed: 05/24/2023]
Abstract
We have used complete correlated momentum mapping of the photoelectron and heavy ion products from the dissociation of the di-cation of acetylene, induced by photoionizing the carbon K shell of one of the atoms, to map out the angular correlation between the electron and the axis of the target molecule. The (quasi-) symmetric decay is found to proceed through both acetylene and vinylidene configurations. By using the strongly peaked photoelectron emission to "start a clock," an upper limit of 60 fs is placed on the isomerization time from the acetylene to the vinylidene configuration.
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Affiliation(s)
- T Osipov
- J. R. Macdonald Laboratory, Physics Department, Kansas State University, Manhattan, KS 66506, USA
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19
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Metsälä M, Yang S, Vaittinen O, Halonen L. Laser-induced dispersed vibration–rotation fluorescence of acetylene: Spectra oforthoandparaforms and partial trapping of vibrational energy. J Chem Phys 2002. [DOI: 10.1063/1.1513464] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
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20
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Silva ML, Jacobson MP, Duan Z, Field RW. Unexpected simplicity in the S1–S0 dispersed fluorescence spectra of 13C2H2. J Chem Phys 2002. [DOI: 10.1063/1.1469018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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21
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WEIRAUCH G, IDRISSI MIEL, VANDER AUWERA J, HERMAN M, CAMPARGUE A. The absorption spectrum of12C2D2in the 10000–12500 cm−1spectral region. Mol Phys 2001. [DOI: 10.1080/00268970010039572] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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