Measurement of the Linewidths of Hydrogen Fluoride Q-Transitions Using Coherent Anti-Stokes Raman Spectroscopy.
Abstract
For this thesis the measurement of the linewidths of the hydrogen Fluoride Q-branch vibrational-rotational transitions was performed using coherent anti-Stokes Raman spectroscopy (CARS). A broadband CARS system was used to excite the first seven vibrational-rotational transitions in the Q-branch of HF. Low resolution spectra were recorded on an optical multichannel analyzer at pressures from 50 to 700 torr in 50 torr increments. At each pressure, 1000 measurements were averaged. A computer was programmed to best fit calculated spectra to experimental spectra by adjusting the linewidths. The linewidth of the Q(3) transition was estimated from infrared data then used as a reference in determining the linewidths of the other transition. All lines displayed pressure broadening in the pressure region investigated with relative magnitudes consistent with theory and available infrared data. Although the Q-branch lines of the observed spectra were partially blended, the CARS measurements and calculations permitted consistent linewidth measurements over the experimental pressure range. Accurate knowledge of the instrument slit function permits linewidth measurements without requiring a reference. Originator supplied keywords include: Molecular spectroscopy; Hydrogen fluoride; Raman spectroscopy; and Infrared spectroscopy.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1983
- Accession Number
- ADA151703
Entities
People
- R. A. Cleis
Organizations
- Air Force Institute of Technology