Observation of an electronic state of C sub 2 H near 9 eV by resonance ionization spectroscopy

Journal Article · Sat Jun 01 04:00:00 EDT 1991 · Journal of Chemical Physics; (USA)

DOI:https://doi.org/10.1063/1.460231· OSTI ID:5594883

Cool, T A; Goodwin, P M ^[1]

---

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

A new electronic state of C{sub 2}H, tentatively assigned as the 3{ital p}{sigma} {sup 2}{Pi} Rydberg state, has been observed by resonance-enhanced multiphoton spectroscopy (REMPI). The observed absorptions originate from vibrationally excited C{sub 2}H and C{sub 2}D formed in the photodissociation of C{sub 2}H{sub 2}, C{sub 2}D{sub 2}, and C{sub 2}HD at 193 nm in a molecular beam. Two-laser experiments and REMPI spectroscopy of photofragments of the dissociation of C{sub 2}HD were used to assign the carriers of the observed spectra to C{sub 2}H and C{sub 2}D. Two-photon resonant, three-photon ionization (2+1 REMPI) of C{sub 2}H and C{sub 2}D is accompanied by substantial fragmentation to C{sup +}{sub 2} ions caused by multiple photon absorption by resonantly excited C{sub 2}H and C{sub 2}D. The identity of the lower C{sub 2}H electronic state(s) ({ital {tilde A}} {sup 2}{Pi} or {ital {tilde X}} {sup 2}{Sigma}{sup +} ) was not established.

• DOE Contract Number: FG02-86ER13508
• OSTI ID: 5594883
• Journal Information: Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 94:11; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ACETYLENE
ALKYNES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
DECOMPOSITION
DEUTERIUM COMPOUNDS
ELECTRONIC STRUCTURE
ENERGY LEVELS
EXCITED STATES
FRAGMENTATION
HYDROCARBONS
HYDROGEN COMPOUNDS
IONIZATION
MULTI-PHOTON PROCESSES
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOIONIZATION
PHOTOLYSIS
RADICALS
RYDBERG STATES