Measurement of Fluorine Atom Concentrations and Reaction Rates in Chemical Laser Systems

The line positions of all three components of the fluorine atom ground state fine structure transition have been measured by diode laser absorption spectroscopy, using a water vapor pure rotational line at 404.077/cm as a wavelength reference. These results imply a spin orbit splitting for fluorine...

Full description

Saved in:
Bibliographic Details
Main Authors: Stanton,Alan C, Wormhoudt,Joda C, Duff,James W
Format: Report
Language:English
Subjects:
ARGON
ATOMIC SPECTROSCOPY
ATOMS
CHEMICAL LASERS
CONCENTRATION(CHEMISTRY)
Diode lasers
DIODES
ELECTRON PARAMAGNETIC RESONANCE
FLUORINE
FREQUENCY
HELIUM
Lasers and Masers
MEASUREMENT
MOLECULAR ORBITALS
PE61102F
RATES
REACTION KINETICS
SPIN RESONANCE
TRANSITIONS
WUAFOSR2301A1
Online Access:Request full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The line positions of all three components of the fluorine atom ground state fine structure transition have been measured by diode laser absorption spectroscopy, using a water vapor pure rotational line at 404.077/cm as a wavelength reference. These results imply a spin orbit splitting for fluorine of 404.142 + or - 0.005/cm. The results for the line positions are in excellent agreement with independent, concurrent measurements performed at the Los Alamos National Laboratory, using vibration-rotation lines of CS2 as the wavelength references. The line separations observed in both sets of experiments agree with the F atom zero-field hyperfine splittings obtained from electron paramagnetic resonance studies. Collisional broadening of the strongest fluorine atom transition (the 1 approximate 2 hyperfine component) was measured in this study for helium (T = 300 K to 800 K), argon (T = 300 K) and nitrogen (T = 300 K) perturbers. The experimental results for fluorine atom line widths are compared with predictions from the classical Lindholm-Foley theory, using available ab initio and experimentally-derived fluorine atom-rare gas interaction potentials, as well as semiempirical Lennard-Jones potentials. Good agreement is obtained for broadening by argon and for the temperature dependence of broadening by helium.