Accession Number:

AD0626745

Title:

STATUS OF RESEARCH PROBLEMS.

Descriptive Note:

Status rept. no. 27,

Corporate Author:

ROCHESTER UNIV N Y

Personal Author(s):

Report Date:

1966-01-01

Pagination or Media Count:

2.0

Abstract:

Absorption of Benzene in the 2000 A Region Systematic measurements of absorption at an extensive series of pressures and temperatures showed a new resolved vibrational transition 1 yields 0 in absorption from a first vibrational level of the ground state to the zero vibrational level of the second excited state. Systematic study of C6D6 under the same conditions showed an analogous transition. The new 1 yields 0 transition is significant in relation to interpretation of the electronic transition responsible for absorption in this region and the nature of the excited electronic state. Slight photochemical decomposition of C6H6 and C6D6 occurs after continued exposure to the hydrogen continuum used as background source. Decomposition is eliminated or greatly reduced by interposing a thin film of liquid water between the source and absorption cell, which removes radiation near 1850 A responsible for the photochemical reaction. Lifetime of the First Excited State of SO2 Further attempts were made to obtain uncontaminated spectra of SO2 with an electrodeless discharge from a Tesla coil, but at pressures one mm. the impurity decomposition spectra were more intense than the SO2 spectrum. Measurements of the lifetime of decay of fluorescence were made. Below one mm pressure, an apparent value about 20 microseconds was found. This value was independent of the pressure in this range and independent of wavelength.

Subject Categories:

  • Radiation and Nuclear Chemistry
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE