Resonance ionization spectroscopy of HCO and DCO. II. The tilde B sup 2 A prime state

Journal Article · Mon Jun 15 04:00:00 EDT 1992 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.462274· OSTI ID:7183143

Cool, T A; Song, X ^[1]

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1. School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853 (United States)

Resonance two-photon ionization (R2PI) spectroscopy of the HCO {ital {tilde B}}{l arrow}{ital {tilde X}} hydrocarbon flame'' band system performed with a jet-cooled molecular beam at 5 K has permitted the assignment of subband origins for 17 vibronic bands of HCO and 20 of DCO. Term values, the three harmonic vibrational frequencies and six anharmonicity constants are measured for the {ital {tilde B}} {sup 2}{ital A}{prime} states of both molecules. The observation of an increase in the effective asymmetric top rotational constant, {ital A}--({ital B}+{ital C})/2, with increasing vibrational quantum number identifies the {ital {tilde B}} state bending vibration with fundamental frequencies of 1382 and 1213 cm{sup {minus}1} for HCO and DCO, respectively. The highest fundamental frequencies of 2597 cm{sup {minus}1} for HCO and 1944 cm{sup {minus}1} for DCO correspond to CH(CD) stretching, while the lowest fundamental frequencies of 1066 cm{sup {minus}1} for HCO and 922 cm{sup {minus}1} for DCO correspond to the vibration of singly bonded C--O.

• DOE Contract Number: FG02-86ER13508
• OSTI ID: 7183143
• Journal Information: Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 96:12; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION
ANHARMONIC OSCILLATORS
ASYMMETRY
BEAMS
CHEMICAL BONDS
CHEMICAL REACTIONS
COOLING
DEUTERATION
ELECTRONIC EQUIPMENT
ENERGY LEVELS
EQUIPMENT
EXCITED STATES
FLAMES
HARMONIC OSCILLATORS
ION SPECTROSCOPY
IONIZATION
JETS
MOLECULAR BEAMS
MULTI-PHOTON PROCESSES
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OSCILLATORS
PHOTOIONIZATION
RESONANCE ABSORPTION
SORPTION
SPECTROSCOPY
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K
VIBRATIONAL STATES