High precision dipole moments in à 1A2 formaldehyde determined via Stark quantum beat spectroscopy

P. H. Vaccaro, Ann I Zabludoff, M. E. Carrera-Patiño, J. L. Kinsey, R. W. Field

Research output: Contribution to journalArticle

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Abstract

The high resolution technique of Stark quantum beat spectroscopy is used to examine the electric dipole moment function for the first excited singlet state (à 1A2) of formaldehyde-h2 and formaldehyde-d2. The high precision of these measurements (i.e., better than 5 parts in 104) enables detailed determination of a-axis dipole moment components (μa) for individual J = 2 rovibronic levels in the ν4 out-of-plane bending mode. In the case of 2 1,1 rotational levels, we find μa (40) = 1.4784(7) D and μa (41) = 1.4678(4) D for H 2CO. For D2CO the measured 21,1 dipole moments are μa (40) = 1.4698(6) D,μa(4 1) = 1.4693(3) D, and μae(43) = 1.4786(7) D. The state-specific variations in μa revealed by this study reflect the structural influences exerted by the pervasive S1∼ S0 nonadiabatic interactions and the pyramidally distorted equilibrium configuration which characterize the à state of formaldehyde. The origin and experimental manifestation of the out-of-plane dipole moment component (μc) in nonrigid à 1A2 formaldehyde is also discussed.

Original languageEnglish (US)
Pages (from-to)4150-4167
Number of pages18
JournalThe Journal of Chemical Physics
Volume90
Issue number8
StatePublished - 1989
Externally publishedYes

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Dipole moment
formaldehyde
Formaldehyde
synchronism
dipole moments
Spectroscopy
spectroscopy
Electric dipole moments
electric moments
Excited states
electric dipoles
high resolution
configurations
excitation
interactions

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Vaccaro, P. H., Zabludoff, A. I., Carrera-Patiño, M. E., Kinsey, J. L., & Field, R. W. (1989). High precision dipole moments in à 1A2 formaldehyde determined via Stark quantum beat spectroscopy. The Journal of Chemical Physics, 90(8), 4150-4167.

High precision dipole moments in à 1A2 formaldehyde determined via Stark quantum beat spectroscopy. / Vaccaro, P. H.; Zabludoff, Ann I; Carrera-Patiño, M. E.; Kinsey, J. L.; Field, R. W.

In: The Journal of Chemical Physics, Vol. 90, No. 8, 1989, p. 4150-4167.

Research output: Contribution to journalArticle

Vaccaro, PH, Zabludoff, AI, Carrera-Patiño, ME, Kinsey, JL & Field, RW 1989, 'High precision dipole moments in à 1A2 formaldehyde determined via Stark quantum beat spectroscopy', The Journal of Chemical Physics, vol. 90, no. 8, pp. 4150-4167.
Vaccaro, P. H. ; Zabludoff, Ann I ; Carrera-Patiño, M. E. ; Kinsey, J. L. ; Field, R. W. / High precision dipole moments in à 1A2 formaldehyde determined via Stark quantum beat spectroscopy. In: The Journal of Chemical Physics. 1989 ; Vol. 90, No. 8. pp. 4150-4167.
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abstract = "The high resolution technique of Stark quantum beat spectroscopy is used to examine the electric dipole moment function for the first excited singlet state ({\~A} 1A2) of formaldehyde-h2 and formaldehyde-d2. The high precision of these measurements (i.e., better than 5 parts in 104) enables detailed determination of a-axis dipole moment components (μa) for individual J = 2 rovibronic levels in the ν4 out-of-plane bending mode. In the case of 2 1,1 rotational levels, we find μa (40) = 1.4784(7) D and μa (41) = 1.4678(4) D for H 2CO. For D2CO the measured 21,1 dipole moments are μa (40) = 1.4698(6) D,μa(4 1) = 1.4693(3) D, and μae(43) = 1.4786(7) D. The state-specific variations in μa revealed by this study reflect the structural influences exerted by the pervasive S1∼ S0 nonadiabatic interactions and the pyramidally distorted equilibrium configuration which characterize the {\~A} state of formaldehyde. The origin and experimental manifestation of the out-of-plane dipole moment component (μc) in nonrigid {\~A} 1A2 formaldehyde is also discussed.",
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N2 - The high resolution technique of Stark quantum beat spectroscopy is used to examine the electric dipole moment function for the first excited singlet state (à 1A2) of formaldehyde-h2 and formaldehyde-d2. The high precision of these measurements (i.e., better than 5 parts in 104) enables detailed determination of a-axis dipole moment components (μa) for individual J = 2 rovibronic levels in the ν4 out-of-plane bending mode. In the case of 2 1,1 rotational levels, we find μa (40) = 1.4784(7) D and μa (41) = 1.4678(4) D for H 2CO. For D2CO the measured 21,1 dipole moments are μa (40) = 1.4698(6) D,μa(4 1) = 1.4693(3) D, and μae(43) = 1.4786(7) D. The state-specific variations in μa revealed by this study reflect the structural influences exerted by the pervasive S1∼ S0 nonadiabatic interactions and the pyramidally distorted equilibrium configuration which characterize the à state of formaldehyde. The origin and experimental manifestation of the out-of-plane dipole moment component (μc) in nonrigid à 1A2 formaldehyde is also discussed.

AB - The high resolution technique of Stark quantum beat spectroscopy is used to examine the electric dipole moment function for the first excited singlet state (à 1A2) of formaldehyde-h2 and formaldehyde-d2. The high precision of these measurements (i.e., better than 5 parts in 104) enables detailed determination of a-axis dipole moment components (μa) for individual J = 2 rovibronic levels in the ν4 out-of-plane bending mode. In the case of 2 1,1 rotational levels, we find μa (40) = 1.4784(7) D and μa (41) = 1.4678(4) D for H 2CO. For D2CO the measured 21,1 dipole moments are μa (40) = 1.4698(6) D,μa(4 1) = 1.4693(3) D, and μae(43) = 1.4786(7) D. The state-specific variations in μa revealed by this study reflect the structural influences exerted by the pervasive S1∼ S0 nonadiabatic interactions and the pyramidally distorted equilibrium configuration which characterize the à state of formaldehyde. The origin and experimental manifestation of the out-of-plane dipole moment component (μc) in nonrigid à 1A2 formaldehyde is also discussed.

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