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Multiphoton ionization of SiH3 and SiD3 radicals. II. Three-photon resonance-enhanced spectra observed between 450 and 610 nm

J. Chem. Phys. 94, 5331 (1991); doi:10.1063/1.460518

Issue Date: 15 April 1991

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Russell D. Johnson III and Jeffrey W. Hudgens
National Institute of Standards and Technology, Chemical Kinetics and Thermodynamics Division, Gaithersburg, Maryland 20899
The electronic spectra of silyl radicals, SiH3 and SiD3, were observed between 450 and 610 nm (49 200-65 200 cm−1 ) by resonance enhanced multiphoton ionization (REMPI) spectroscopy. The spectra were produced through a 3+1 REMPI mechanism. Spectra of four new planar Rydberg states were observed and assigned. In SiH3 the observed states and spectroscopic constants are D-tilde 2A<sup>[script ']</sup><sub>1</sub>(3d)[large-closed-square] T0=49 787(30), omega2=810(31) cm−1; I-tilde [script '] (4d): T0=56 253(30), omega2=814(25) cm−1; J-tilde [script '] (4d): T0=57 726(30), omega2=835(26) cm−1; and L-tilde (5d): T0=59 615(30) cm−1, omega2=839(26) cm−1. In SiD3 the observed states and spectroscopic constants are D-tilde 2A<sup></sup><sub>1</sub>(3d) T0=49 685(30), omega2=600(28) cm−1; I-tilde [script '] (4d):T0=56 205(30), omega2=600(17) cm−1; and J-tilde [script '] (4d):T0=57 840(30), omega2=603(20) cm−1. The differences between 2+1 and 3+1 REMPI spectra are explained by a Deltal rule, where l is the electronic orbital angular momentum. The H-tilde, K-tilde, and N-tilde states observed in the 2+1 REMPI spectrum of SiD3 spectrum and reported in J. Chem. Phys. 91, 3340 (1989) are reassigned as the H-tilde 2E[script '] (4p), K-tilde 2E[script '] (4f), and N-tilde 2E[script '] (5f). The Journal of Chemical Physics is copyrighted by The American Institute of Physics.
History: Received 1 November 1990; accepted 10 January 1991
Permalink: http://link.aip.org/link/?JCPSA6/94/5331/1
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KEYWORDS and PACS

Keywords
PACS
  • 33.20.Kf
    Molecular spectra and interactions of molecules with photons Molecular spectra, grouped by wavelength ranges Visible spectra
  • 33.80.Rv
    Molecular spectra and interactions of molecules with photons Photon interactions with molecules Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states)
  • 35.20.Pa
    Experimentally derived information on atoms and molecules; instrumentation and techniques Molecules Rotation, vibration, and vibrationrotation constants
  • YEAR: 1990-91

PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
Publisher:
AIP is a member of CrossRef AIP

REFERENCES (42)
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