Accession Number:

ADA155775

Title:

The Photodissociation of Acetylene at 193.3 NM.

Descriptive Note:

Technical rept.,

Corporate Author:

CALIFORNIA UNIV BERKELEY DEPT OF CHEMISTRY

Personal Author(s):

Report Date:

1985-05-21

Pagination or Media Count:

54.0

Abstract:

We have measured the translational energy release for processes I and II using the Molecular Beam Time-of-Flight method I-C2H2 in the 193 nm range yields C2H H II-C2H in the 193nm range yields C2 H. By measuring the maximum release of transitional energy for process I it has been determined that the C-H bond energy in acetylene, D sub oC2H-H is 132 or - 2 KcalMol. 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 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 or - 100cm. Our experiment is consistent with earlier work on fluorescence. Originator supplied keywords include Photofragmentation translation spectrometer Molecular beams Unimolecular decay Photochemistry Photodissociation Bond energy Acetylene Ethynyl radical.

Subject Categories:

  • Radiation and Nuclear Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE