Abstract

A kilohertz accuracy of line-shape measurements for ethylene and methanol was obtained in the 10-μm region by saturated-absorption heterodyne spectroscopy. For both molecules, precise determination of self-broadening coefficients and values of pressure-induced shifts were carried out at pressures <200 mTorr. Foreign gas effects were investigated for the combinations of collisional partners: ${\mathrm{C}}_2{\mathrm{H}}_4+{\mathrm{O}}_2,$ ${\mathrm{N}}_2,$ He, and ${\mathrm{CH}}_3\mathrm{OH}+{\mathrm{O}}_2.$ Nonlinear line narrowing and change of sign of the line shift were recorded, and some qualitative considerations are presented. Absolute frequencies of the ethylene and methanol rovibrational lines under study were measured with a total experimental uncertainty <5 kHz.

© 1998 Optical Society of America

Saturation-dip measurements for the ν₈ C-O stretching band of CH₃OH with a CO₂-laser-microwave-sideband spectrometer

Zhen-Dong Sun, Ronald M. Lees, and Li-Hong Xu
J. Opt. Soc. Am. B 23(11) 2398-2417 (2006)

Infrared–microwave double-resonance spectroscopy of CH₃OH by use of sidebands of CO₂ laser lines

Zhen-Dong Sun, Fusakazu Matsushima, Shozo Tsunekawa, and Kojiro Takagi
J. Opt. Soc. Am. B 16(9) 1447-1454 (1999)

Measurements of air-, N₂-, and O₂-broadened halfwidths and pressure-induced line shifts in the ν₃ band of ¹³CH₄

V. Malathy Devi, D. Chris Benner, Mary Ann H. Smith, and Curtis P. Rinsland
Appl. Opt. 30(3) 287-304 (1991)

Line centers, pressure shift, and pressure broadening of 1530-1560 nm hydrogen cyanide wavelength calibration lines

William C. Swann and Sarah L. Gilbert
J. Opt. Soc. Am. B 22(8) 1749-1756 (2005)

Pressure-induced shift and broadening of 1510–1540-nm acetylene wavelength calibration lines

W. C. Swann and S. L. Gilbert
J. Opt. Soc. Am. B 17(7) 1263-1270 (2000)