D. G. S. Snyder

Tunable diode laser spectroscopy of NO2 at 6.2 μm

Abstract High-resolution spectra in the ν 3 region of 14 N 16 O 2 were measured by using a diode laser as a source to a vacuum grating spectrometer. Spin-rotation constants for the ν 3 and ν 2 + ν 3 states were determined from the observed data. Absolute strengths and transition moments for the ν 3 and ν 2 + ν 3 − ν 2 bands were derived from the observed line strengths at 296 K. Self-broadened and N 2 -broadened half-widths were measured for several of the ν 3 band lines at room temperature. Temperature-dependent half-widths for two N 2 -broadened ν 3 lines are also reported.

Diode laser measurements of strengths, half-widths, and temperature dependence of half-widths for CO2 spectral lines near 4.2 μm

Abstract Absolute line strengths have been measured at room temperature for spectral lines in the R branch of the ν3 band of 12C16O2, 12C16O18O, and 12C16O17O and the (ν2 + ν3) − ν2 and (ν1 + ν3) − ν1 bands of 12C16O2 in the region 2365–2393 cm−1 using a tunable diode laser spectrometer; from these measurements band strengths have been computed. Self- and nitrogen-broadened half-widths have been measured for some ν3 lines of 12C16O2 and 12C16O17O, and nitrogen-broadened half-widths measured for some (ν2 + ν3) − ν2 band lines of 12C16O2. From measurements made over a temperature range from 217 to 299 K we have obtained temperature coefficients n, for the N2-broadened Lorentz half-width defined as b L 0 (T) = b L 0 (T 0 )( T T 0 ) −n , for the ν3 and (ν2 + ν3) − ν2 bands of 12C16O2. They are 0.757 ± 0.008 and 0.789 ± 0.015, respectively.

Strengths and lorentz broadening coefficients for spectral lines in the ν3 and ν2 + ν4 bands of 12CH4 and 13CH4

Abstract Line strengths and self- and nitrogen-broadened half-widths were measured for spectral lines in the ν3 and ν2 + ν4 bands of 12CH4 and 13CH4 from 2870–2883 cm−1 using a tunable diode laser spectrometer. From measurements made over a temperature range from 215 to 297 K, on samples of 12CH4 broadened with N2, we deduced that the average temperature coefficients n, defined as b L 0 (T) = b L 0 (T 0 )( T T 0 ) −n , of the Lorentz broadening coefficients for the ν3 and ν2 + ν4 bands of 12CH4 were 0.97 ± 0.03 and 0.89 ± 0.04, respectively. A smaller increase is observed in line half-width with increasing pressure for E-species lines, for both self- and nitrogen-broadening, than for other symmetry species lines over the range of pressures measured, 70 to 100 Torr.

Tunable diode laser measurements of intensities and Lorentz broadening coefficients of lines in the ν2 band of 12CH4

Abstract Absolute line strengths and self-, nitrogen-, and air-broadened half-widths, for five lines in the R -branch of the ν 2 fundamental of methane have been measured at room temperature using a tunable diode laser spectrometer.

Intensities and half-widths for several H2O ν2 lines in the region 1500–1523 cm−1

Abstract Intensities and half-widths have been measured, using a tunable diode laser, for several water vapor lines in the ν 2 spectral region between 1500 and 1523 cm −1 . Where possible, results have been compared with previously published values.