Propensities toward C{sub 2}H({ital {tilde A}} {sup 2}{Pi}) in acetylene photodissociation

Journal Article · Sun Oct 15 00:00:00 EDT 1995 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.470361· OSTI ID:118401

Zhang, J; Riehn, C W; Dulligan, M; Wittig, C ^[1]

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1. Department of Chemistry, University of Southern California, Los Angeles, California 90089-0482 (United States)

When expansion-cooled acetylene is excited to the {nu}{sup {double_prime}}{sub 1}+3{nu}{sup {double_prime}}{sub 3} vibrational level (4 quanta of CH-stretch) and then photodissociated at 248.3 nm, the dominant product channel is C{sub 2}H({ital {tilde A}} {sup 2}{Pi}). This differs markedly from one-photon 193.3 nm photodissociation, which provides 1200 cm{sup {minus}1} less energy and yields C{sub 2}H({ital {tilde X}} {sup 2}{Sigma}{sup +}) as the primary product. Photodissociation at 121.6 nm yields C{sub 2}H({ital {tilde A}} {sup 2}{Pi}) exclusively. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.

• DOE Contract Number: FG03-85ER13363
• OSTI ID: 118401
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 15 Vol. 103; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ACETYLENE
DISSOCIATION
ELECTRONIC STRUCTURE
EXCITATION
EXCITED STATES
FAR ULTRAVIOLET RADIATION
PHOTOLYSIS
VIBRATIONAL STATES