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Applied Optics

Applied Optics


  • Vol. 29, Iss. 15 — May. 20, 1990
  • pp: 2295–2302

Empirical values of the ground state energies for methane transitions between 5500 and 6150 cm−1

Jack S. Margolis  »View Author Affiliations

Applied Optics, Vol. 29, Issue 15, pp. 2295-2302 (1990)

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The strengths of more than 1600 lines of CH4 have been measured in the spectral interval between 5500 and 6150 cm−1 at room temperature and reduced temperatures. The variation of the measured strengths allows the energy of the lower state of the transition to be determined empirically using the temperature dependence of the methane partition function and the Boltzmann factor for the energy level populations. An error analysis, based on assumed errors in the strength and temperature measurements, is included. The average measured uncertainty in J is 0.2.

© 1990 Optical Society of America

Original Manuscript: July 31, 1989
Published: May 20, 1990

Jack S. Margolis, "Empirical values of the ground state energies for methane transitions between 5500 and 6150 cm−1," Appl. Opt. 29, 2295-2302 (1990)

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  1. J. S. Margolis, “Measured Line Positions and Strengths of Methane Between 5500 and 6180 cm−1,” Appl. Opt. 27, 4038–4050 (1988). [CrossRef] [PubMed]
  2. J. Ballard, W. B. Johnston, “Self-Broadened Widths and Absolute Strengths of 12CH4 Lines in the 1310–1370 cm−1 Region,” J. Quant. Spectrosc. Radiat. Transfer. 36, 365–371 (1986). [CrossRef]
  3. V. Malathy Devi, B. Fridovich, G. D. Jones, D. G. S. Snyder, “Strengths and Lorentz Broadening Coefficients for Spectral Lines in the ν3 and ν2 + ν4 bands of 12CH4 and 13CH4,” J. Mol. Spectrosc. 97, 333–342 (1983). [CrossRef]
  4. K. Fox, “On the Rotational Partition Function for Tetrahedral Molecules,” J. Quant. Spectrosc. Radiat. Transfer. 10, 1335–1342 (1970). [CrossRef]
  5. G. Tarrago, M. Dang-Nhu, G. Poussigue, G. Guelachvili, C. Amiot, “The Ground State of Methane 12CH4 Through the Forbidden Lines of the ν3 Band,” J. Mol. Spectrosc. 57, 246–263 (1975). [CrossRef]

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