Publication Abstracts

Tipping et al. 2001

Tipping, R.H., A. Brown, Q. Ma, J.M. Hartmann, C. Boulet, and J. Lievin, 2001: Collision-induced absorption in the ν2 fundamental band of CH4. I. Determination of the quadrupole transition moment. J. Chem. Phys., 115, 8852-8857, doi:10.1063/1.1408915.

An experimental value for the quadrupole transition moment of the ν2 fundamental band of CH4 has been determined by fitting the collision-induced enhancement spectrum of CH4 with Ar as the perturber. The observed quadrupole-induced absorption increases linearly with the Ar density, ρAr, and is comparable to the allowed dipole intensity due to Coriolis interaction with the ν4 band at approximately 125 amagats. Ignoring vibration-rotation interaction and Coriolis interaction, we equate the measured slope of the integrated intensity versus ρAr to the theoretical expression for the quadrupole-induced absorption, and obtain the value |<0|Q|ν2>| = 0.445 ea02 for the quadrupole transition element. A theoretical value <0|Q|ν2> = 0.478 ea02 has been determined by large-scale ab initio calculations and, considering both the theoretical approximations and experimental uncertainties, we regard the agreement as good, thus confirming our interpretation of the enhancement as due to the quadupole collision-induced mechanism.

Export citation: [ BibTeX ] [ RIS ]

BibTeX Citation

@article{ti03000u,
  author={Tipping, R. H. and Brown, A. and Ma, Q. and Hartmann, J. M. and Boulet, C. and Lievin, J.},
  title={Collision-induced absorption in the ν2 fundamental band of CH4. I. Determination of the quadrupole transition moment},
  year={2001},
  journal={J. Chem. Phys.},
  volume={115},
  pages={8852--8857},
  doi={10.1063/1.1408915},
}

[ Close ]

RIS Citation

TY  - JOUR
ID  - ti03000u
AU  - Tipping, R. H.
AU  - Brown, A.
AU  - Ma, Q.
AU  - Hartmann, J. M.
AU  - Boulet, C.
AU  - Lievin, J.
PY  - 2001
TI  - Collision-induced absorption in the ν2 fundamental band of CH4. I. Determination of the quadrupole transition moment
JA  - J. Chem. Phys.
VL  - 115
SP  - 8852
EP  - 8857
DO  - 10.1063/1.1408915
ER  -

[ Close ]

• Return to 2001 Publications

• Return to Publications Homepage