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High precision dipole moments in A-tilde 1A2 formaldehyde determined via Stark quantum beat spectroscopy

J. Chem. Phys. 90, 4150 (1989); doi:10.1063/1.455773

Issue Date: 15 April 1989

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P. H. Vaccaro, A. Zabludoff, M. E. Carrera-Patiño, J. L. Kinsey, and R. W. Field
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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-tilde 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 nu4 out-of-plane bending mode. In the case of 21,1 rotational levels, we find µa (40)=1.4784(7) D and µa (41)=1.4678(4) D for H2CO. For D2CO the measured 21,1 dipole moments are µa (40)=1.4698(6) D, µa (41)=1.4693(3) D, and µa (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-tilde state of formaldehyde. The origin and experimental manifestation of the out-of-plane dipole moment component (µc ) in nonrigid A-tilde 1A2 formaldehyde is also discussed. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.
History: Received 21 November 1988; accepted 28 December 1988
Permalink: http://link.aip.org/link/?JCPSA6/90/4150/1
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KEYWORDS and PACS

Keywords
PACS
  • 35.20.My
    Experimentally derived information on atoms and molecules; instrumentation and techniques Molecules Electric and magnetic moments (and derivatives), polarizability, and magnetic susceptibility
  • 33.55.Be
    Molecular spectra and interactions of molecules with photons Optical activity and dichroism; magnetooptical and electrooptical spectra Zeeman and Stark effects
  • 35.80.+s
    Experimentally derived information on atoms and molecules; instrumentation and techniques Atomic and molecular measurement and techniques
  • YEAR: 1988-89

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0021-9606 (print)   1089-7690 (online)
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