Photodissociation of acetylene at 193. 3 nm

Journal Article · Wed Oct 23 20:00:00 EDT 1985 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100268a019· OSTI ID:6052183

Wodtke, A M; Lee, Y T

The authors have measured the translational energy release for processes C2H2 193 nm/ C2H + H (I) and C2H 193 nm/ C2 + H (II) using the molecular time-of-flight method. By measuring the maximum release of translational energy for process I it has been determined that the C-H bond energy in acetylene, D0(C2H-H), is 132 +/- 2 kcal/mol. Since the translational energy distribution peaks well away from zero, it is quite unlikely that internal conversion of the electronically excited C2H2 is an important channel for dissociation in channel I. Because of the relatively small amount of energy appearing as product rotation, it is possible to get information on the vibrational structure of C2H radical from the translational energy distribution and it is found that the bending frequency in C2H is 550 +/- 100 cm . This experiment is consistent with earlier work which observed C2( /sub u/) in fluorescence. 21 references, 20 figures, 3 tables.

• Research Organization: Univ. of California, Berkeley
• OSTI ID: 6052183
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 89:22; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
400800 -- Combustion
Pyrolysis
& High-Temperature Chemistry
ACETYLENE
ALKYNES
BEAMS
BINDING ENERGY
CHEMICAL LASERS
CHEMICAL REACTIONS
DATA
DECOMPOSITION
DISSOCIATION
ENERGY
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
LASERS
MASS SPECTROSCOPY
MOLECULAR BEAMS
NUMERICAL DATA
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
SPECTROSCOPY
TIME-OF-FLIGHT METHOD