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Schmidt decomposition analysis of normal- to local-mode transition in highly excited molecular vibration. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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2
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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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3
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Herman M, Földes T, Didriche K, Lauzin C, Vanfleteren T. Overtone spectroscopy of molecular complexes containing small polyatomic molecules. INT REV PHYS CHEM 2016. [DOI: 10.1080/0144235x.2016.1171039] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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4
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Steeves AH, Park GB, Bechtel HA, Baraban JH, Field RW. Communication: Observation of local-bender eigenstates in acetylene. J Chem Phys 2015; 143:071101. [PMID: 26298106 DOI: 10.1063/1.4928638] [Citation(s) in RCA: 3] [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 report the observation of eigenstates that embody large-amplitude, local-bending vibrational motion in acetylene by stimulated emission pumping spectroscopy via vibrational levels of the S1 state involving excitation in the non-totally symmetric bending modes. The N(b) = 14 level, lying at 8971.69 cm(-1) (J = 0), is assigned on the basis of degeneracy due to dynamical symmetry breaking in the local-mode limit. The level pattern for the N(b) = 16 level, lying at 10 218.9 cm(-1), is consistent with expectations for increased separation of ℓ = 0 and 2 vibrational angular momentum components. Increasingly poor agreement between our observations and the predicted positions of these levels highlights the failure of currently available normal mode effective Hamiltonian models to extrapolate to regions of the potential energy surface involving large-amplitude displacement along the acetylene ⇌ vinylidene isomerization coordinate.
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Affiliation(s)
- Adam H Steeves
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - G Barratt Park
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Hans A Bechtel
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Joshua H Baraban
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Robert W Field
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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Park GB, Steeves AH, Baraban JH, Field RW. Simplified Cartesian basis model for intrapolyad emission intensities in the bent-to-linear electronic transition of acetylene. J Phys Chem A 2015; 119:857-65. [PMID: 25625552 DOI: 10.1021/jp5113608] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The acetylene emission spectrum from the trans-bent electronically excited à state to the linear ground electronic X̃ state has attracted considerable attention because it grants Franck–Condon access to local bending vibrational levels of the X̃ state with large-amplitude motion along the acetylene ⇌ vinylidene isomerization coordinate. For emission from the ground vibrational level of the à state, there is a simplifying set of Franck–Condon propensity rules that gives rise to only one zero-order bright state per conserved vibrational polyad of the X̃ state. Unfortunately, when the upper level involves excitation in the highly admixed ungerade bending modes, ν4′ and ν6′, the simplifying Franck–Condon propensity rule breaks down--as long as the usual polar basis (with v and l quantum numbers) is used to describe the degenerate bending vibrations of the X̃ state--and the intrapolyad intensities result from complicated interference patterns between many zero-order bright states. In this article, we show that, when the degenerate bending levels are instead treated in the Cartesian two-dimensional harmonic oscillator basis (with vx and vy quantum numbers), the propensity for only one zero-order bright state (in the Cartesian basis) is restored, and the intrapolyad intensities are simple to model, as long as corrections are made for anharmonic interactions. As a result of trans ⇌ cis isomerization in the à state, intrapolyad emission patterns from overtones of ν4′ and ν6′ evolve as quanta of trans bend (ν3′) are added, so the emission intensities are not only relevant to the ground-state acetylene ⇌ vinylidene isomerization, they are also a direct reporter of isomerization in the electronically excited state.
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Affiliation(s)
- G Barratt Park
- Department of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
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Han H, Li A, Guo H. Toward spectroscopically accurate global ab initio potential energy surface for the acetylene-vinylidene isomerization. J Chem Phys 2014; 141:244312. [DOI: 10.1063/1.4904859] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Huixian Han
- Department of Chemistry and Chemical Biology,
University of New Mexico, Albuquerque, New Mexico
87131, USA
- School of Physics, Northwest University, Xi’an, Shaanxi 710069, China
| | - Anyang Li
- Department of Chemistry and Chemical Biology,
University of New Mexico, Albuquerque, New Mexico
87131, USA
| | - Hua Guo
- Department of Chemistry and Chemical Biology,
University of New Mexico, Albuquerque, New Mexico
87131, USA
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Park GB. Full dimensional Franck-Condon factors for the acetylene à (1)A(u)-X̃ (1)Σ(g)(+) transition. I. Method for calculating polyatomic linear-bent vibrational intensity factors and evaluation of calculated intensities for the gerade vibrational modes in acetylene. J Chem Phys 2014; 141:134304. [PMID: 25296803 DOI: 10.1063/1.4896532] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Franck-Condon vibrational overlap integrals for the à Au1-X̃ 1Σg+ transition in acetylene have been calculated in full dimension in the harmonic normal mode basis. The calculation uses the method of generating functions first developed for polyatomic Franck-Condon factors by Sharp and Rosenstock [J. Chem. Phys. 41(11), 3453-3463 (1964)], and previously applied to acetylene by Watson [J. Mol. Spectrosc. 207(2), 276-284 (2001)] in a reduced-dimension calculation. Because the transition involves a large change in the equilibrium geometry of the electronic states, two different types of corrections to the coordinate transformation are considered to first order: corrections for axis-switching between the Cartesian molecular frames and corrections for the curvilinear nature of the normal modes at large amplitude. The angular factor in the wavefunction for the out-of-plane component of the trans bending mode, ν4(″), is treated as a rotation, which results in an Eckart constraint on the polar coordinates of the bending modes. To simplify the calculation, the other degenerate bending mode, ν5(″), is integrated in the Cartesian basis and later transformed to the constrained polar coordinate basis, restoring the conventional v and l quantum numbers. An updated Ã-state harmonic force field obtained recently in the R. W. Field research group is evaluated. The results for transitions involving the gerade vibrational modes are in qualitative agreement with experiment. Calculated results for transitions involving ungerade modes are presented in Paper II of this series [G. B. Park, J. H. Baraban, and R. W. Field, "Full dimensional Franck-Condon factors for the acetylene à Au1-X̃ 1Σg+ transition. II. Vibrational overlap factors for levels involving excitation in ungerade modes," J. Chem. Phys. 141, 134305 (2014)].
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Affiliation(s)
- G Barratt Park
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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8
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Park GB, Baraban JH, Field RW. Full dimensional Franck-Condon factors for the acetylene à 1Au—X̃ Σg+1 transition. II. Vibrational overlap factors for levels involving excitation in ungerade modes. J Chem Phys 2014; 141:134305. [DOI: 10.1063/1.4896533] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- G. Barratt Park
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Joshua H. Baraban
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Robert W. Field
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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9
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Larese D, Caprio MA, Pérez-Bernal F, Iachello F. A study of the bending motion in tetratomic molecules by the algebraic operator expansion method. J Chem Phys 2014; 140:014304. [DOI: 10.1063/1.4856115] [Citation(s) in RCA: 15] [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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10
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Ma J, Xu D, Guo H, Tyng V, Kellman ME. Isotope effect in normal-to-local transition of acetylene bending modes. J Chem Phys 2012; 136:014304. [DOI: 10.1063/1.3673570] [Citation(s) in RCA: 9] [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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11
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Han J, Freel K, Heaven MC. Rotational and vibrational energy transfer in vibrationally excited acetylene at energies near 6560 cm−1. J Chem Phys 2011; 135:244304. [DOI: 10.1063/1.3671459] [Citation(s) in RCA: 11] [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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12
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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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13
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Didriche K, Herman M. A four-atom molecule at the forefront of spectroscopy, intramolecular dynamics and astrochemistry: Acetylene. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.07.031] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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14
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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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HURTMANS D, KASSI S, DEPIESSE C, HERMAN M. Assignment of a perturbation in the FT-ICLAS spectrum of 12C2H2 around 12 709.5 cm−1. Mol Phys 2009. [DOI: 10.1080/00268970210138904] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- D. HURTMANS
- a Laboratoire de Chimie Physique Moléculaire, CP160/09 , Université libre de Bruxelles , Roosevelt Ave., 50, B-1050 , Brussels , Belgium
| | - S. KASSI
- a Laboratoire de Chimie Physique Moléculaire, CP160/09 , Université libre de Bruxelles , Roosevelt Ave., 50, B-1050 , Brussels , Belgium
| | - C. DEPIESSE
- a Laboratoire de Chimie Physique Moléculaire, CP160/09 , Université libre de Bruxelles , Roosevelt Ave., 50, B-1050 , Brussels , Belgium
| | - M. HERMAN
- a Laboratoire de Chimie Physique Moléculaire, CP160/09 , Université libre de Bruxelles , Roosevelt Ave., 50, B-1050 , Brussels , Belgium
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16
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Iachello F, Pérez-Bernal F. A Novel Algebraic Scheme for Describing Coupled Benders in Tetratomic Molecules. J Phys Chem A 2009; 113:13273-86. [DOI: 10.1021/jp9040474] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- F. Iachello
- Center for Theoretical Physics, Sloane Physics Laboratory, Yale University, P.O. Box 208120, New Haven, Connecticut 06520-8120, Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, and Depto. de Física Aplicada, Fac. de Ciencias Experimentales, Universidad de Huelva, Campus del Carmen, Avda. de las Fuerzas Armadas s/n, 21071 Huelva, Spain
| | - F. Pérez-Bernal
- Center for Theoretical Physics, Sloane Physics Laboratory, Yale University, P.O. Box 208120, New Haven, Connecticut 06520-8120, Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, and Depto. de Física Aplicada, Fac. de Ciencias Experimentales, Universidad de Huelva, Campus del Carmen, Avda. de las Fuerzas Armadas s/n, 21071 Huelva, Spain
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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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18
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Irikura KK, Johnson RD, Kacker RN, Kessel R. Uncertainties in scaling factors forab initiovibrational zero-point energies. J Chem Phys 2009; 130:114102. [DOI: 10.1063/1.3086931] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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19
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Merer AJ, Yamakita N, Tsuchiya S, Steeves AH, Bechtel HA, Field RW. Darling–Dennison resonance and Coriolis coupling in the bending overtones of the ÃAu1 state of acetylene, C2H2. J Chem Phys 2008; 129:054304. [DOI: 10.1063/1.2939246] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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20
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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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Wong BM, Steeves AH, Field RW. Electronic Signatures of Large Amplitude Motions: Dipole Moments of Vibrationally Excited Local-Bend and Local-Stretch States of S0 Acetylene. J Phys Chem B 2006; 110:18912-20. [PMID: 16986883 DOI: 10.1021/jp061924x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A one-dimensional local bend model is used to describe the variation of electronic properties of acetylene in vibrational levels that embody large amplitude local motions on the S0 potential energy surface. Calculations performed at the CCSD(T) and MR-AQCC levels of theory predict an approximately linear dependence of the dipole moment on the number of quanta in either the local bending or local stretching excitation. In the local mode limit, one quantum of stretching excitation in one CH bond leads to an increase of 0.025 D in the dipole moment, and one quantum of bending vibration in the CCH angle leads to an increase of 0.068 D. The use of a one-dimensional model for the local bend is justified by comparison to the well-established polyad model which reveals a decoupling of the large amplitude bending from other degrees of freedom in the range of Nbend = 14-22. We find that the same one-dimensional large amplitude bending motion emerges from two profoundly different representations, a one-dimensional cut through an ab initio, seven-dimensional Hamiltonian and the three-dimensional (l = 0) pure-bending experimentally parametrized spectroscopic Hamiltonian.
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Affiliation(s)
- Bryan M Wong
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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Tyng V, Kellman ME. Bending Dynamics of Acetylene: New Modes Born in Bifurcations of Normal Modes. J Phys Chem B 2006; 110:18859-71. [PMID: 16986877 DOI: 10.1021/jp057357f] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Semiclassical techniques are used to analyze highly excited pure bending vibrational dynamics from spectra of C2H2. An analytic bifurcation approach is developed, based on critical points of a classical version of the quantum fitting Hamiltonian. At high energy four new types of anharmonic modes are born in bifurcations of the normal modes: local, orthogonal, precessional, and counter-rotator. Visual insight into their nature is obtained with the help of computer-generated three-dimensional animations. The connection between the local mode and the acetylene-vinylidene isomerization "reaction mode" is considered.
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Affiliation(s)
- Vivian Tyng
- Department of Chemistry, University of Oregon, Eugene, Oregon 97403, USA
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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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Robert S, Fayt A, Di Lonardo G, Fusina L, Tamassia F, Herman M. The vibrational energy pattern in acetylene VII: C12C13H2. J Chem Phys 2005; 123:174302. [PMID: 16375523 DOI: 10.1063/1.2056538] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In (12)C(13)CH(2) 129 vibrational term values up to 10,000 cm(-1) are merged, about 60% of which are newly reported. They are fitted using an effective Hamiltonian with a standard deviation of 0.22 cm(-1). The vibrational assignments and vibrational constants are listed and discussed. The energy pattern is found to be very similar to the one in (12)C2H2 with additional anharmonic resonances arising from the lack of u/g character in the asymmetric isotopolog.
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Affiliation(s)
- S Robert
- Service de Chimie Quantique et Photophysique CP 160/09, Université Libre de Bruxelles, Avenue Franklin D. Roosevelt, 50 B-1050, Bruxelles, Belgium
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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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Payne MA, Milce AP, Frost MJ, Orr BJ. Rovibrational Energy Transfer in the 4νCH Manifold of Acetylene, Viewed by IR−UV Double Resonance Spectroscopy. 1. Foundation Studies at Low J. J Phys Chem A 2003. [DOI: 10.1021/jp035224t] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [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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New vibrational force-field expansion of coupled linear benders: application to the X state of acetylene. Chem Phys Lett 2003. [DOI: 10.1016/s0009-2614(03)00916-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Yamakita N, Iwamoto S, Tsuchiya S. Predissociation of Excited Acetylene in the ÃAu State around the Adiabatic Dissociation Threshold as Studied by LIF and H-Atom Action Spectroscopy. J Phys Chem A 2003. [DOI: 10.1021/jp0217785] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Nami Yamakita
- Department of Chemical and Biological Sciences, Faculty of Science, Japan Women's University, Mejirodai, Bunkyo-ku, Tokyo 112-8681, Japan
| | - Sayoko Iwamoto
- Department of Chemical and Biological Sciences, Faculty of Science, Japan Women's University, Mejirodai, Bunkyo-ku, Tokyo 112-8681, Japan
| | - Soji Tsuchiya
- Department of Chemical and Biological Sciences, Faculty of Science, Japan Women's University, Mejirodai, Bunkyo-ku, Tokyo 112-8681, Japan
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IDRISSI MIEL, ZHILINSKII B, GASPARD P, HERMAN M. The integrated number of vibrational states in acetylene (12C2H2,13C2H2,12C2D2). Mol Phys 2003. [DOI: 10.1080/0026897021000024324] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Melikova S, Rutkowski K, Rodziewicz P, Koll A. CH⋯B interactions in acetylene containing solutions: experimental and theoretical DFT studies. J Mol Struct 2003. [DOI: 10.1016/s0022-2860(02)00589-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Kono M, Hoshina K, Yamanouchi K. Photofragment emission yield spectroscopy of acetylene in the D̃ 1Πu, Ẽ 1A, and F̃ 1Σu+ states by vacuum ultraviolet and infrared vacuum ultraviolet double-resonance laser excitations. J Chem Phys 2002. [DOI: 10.1063/1.1485064] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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