Abstract

The collisional widths of ~160 transitions belonging mainly to the 2ν2ν2, 3ν2–2ν2, and 4ν2–3ν2 hot bands of the H216O molecule have been measured on Fourier-transform air–methane flame spectra at 2000 K and analyzed, showing a strong decrease in the collisional widths when the rotational quantum number J increases, as well as a nonnegligible decrease of the collisional widths when the υ2 vibrational quantum number increases.

© 1992 Optical Society of America

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  1. V. Dana, J.-Y. Mandin, C. Camy-Peyret, J.-M. Flaud, J.-P. Chevillard, R. L. Hawkins, J.-L. Delfau, “Measurements of collisional linewidths in the ν2 band of H2O from Fourier-transform flame spectra,” Appl. Opt. (to be published).
  2. J.-M. Flaud, C. Camy-Peyret, “The interacting states (020), (100), and (001) of H216O,” J. Mol. Spectrosc. 51, 142–150 (1974); J.-M. Flaud, C. Camy-Peyret, J.-P. Maillard, “Higher ro-vibrational levels of H2O deduced from high resolution oxygen-hydrogen flame spectra between 2800 and 6200 cm−1,” Mol. Phys. 32, 499–521 (1976); C. Camy-Peyret, J.-M. Flaud, “The interacting states (030), (110), and (011) of H216O,” J. Mol. Spectrosc. 59, 327–337 (1976); C. Camy-Peyret, J.-M. Flaud, J.-P. Maillard, G. Guelachvili, “Higher Ro-vibrational levels of H2O deduced from high resolution oxygen-hydrogen flame spectra between 6200 and 9100 cm−1,” Mol. Phys. 33, 1641–1650 (1977); and C. Camy-Peyret, J.-M. Flaud, J.-P. Maillard, “The 4ν2 band of H216O,” J. Phys. Lett. (France) 41, L23–L26 (1980).
    [CrossRef]
  3. The small values obtained for the standard deviations tend to show that the comparisons are significant, especially for the ν2, 2ν2–ν2, and 3ν2–2ν2 bands that involve a sufficient number of common lines. Although the vibrational decrease of the collisional widths is also observed for the 4ν2–3ν2 band, the sample of transitions belonging to this band and present in the other three is too limited to permit us to make really firm conclusions.
  4. J.-Y. Mandin, J.-P. Chevillard, J.-M. Flaud, C. Camy-Peyret, “N2-broadening coefficients of H216O lines between 8500 and 9300 cm−1,” J. Mol. Spectrosc. 132, 352–360 (1988); J.-Y. Mandin, J.-P. Chevillard, C. Camy-Peyret, J.-M. Flaud, “ν2-broadening coefficients of H216O lines between 9500 and 11500 cm−1,” J. Mol. Spectrosc. 138, 272–281 (1989); J.-Y. Mandin, J.-P. Chevillard, J.-M. Flaud, C. Camy-Peyret, “ν2-broadening coefficients of H216O lines between 13500 and 19900 cm−1,” J. Mol. Spectrosc. 138, 430–439 (1989).
    [CrossRef]
  5. A. D. Bykov, Yu. S. Makushkin, V. N. Stroinova, “Analysis of the effect of vibrational excitation on the halfwidth of lines in the nν2 bands of H2O,” Opt. Spectrosc. (USSR) 64, 309–312 (1988).

1988 (2)

J.-Y. Mandin, J.-P. Chevillard, J.-M. Flaud, C. Camy-Peyret, “N2-broadening coefficients of H216O lines between 8500 and 9300 cm−1,” J. Mol. Spectrosc. 132, 352–360 (1988); J.-Y. Mandin, J.-P. Chevillard, C. Camy-Peyret, J.-M. Flaud, “ν2-broadening coefficients of H216O lines between 9500 and 11500 cm−1,” J. Mol. Spectrosc. 138, 272–281 (1989); J.-Y. Mandin, J.-P. Chevillard, J.-M. Flaud, C. Camy-Peyret, “ν2-broadening coefficients of H216O lines between 13500 and 19900 cm−1,” J. Mol. Spectrosc. 138, 430–439 (1989).
[CrossRef]

A. D. Bykov, Yu. S. Makushkin, V. N. Stroinova, “Analysis of the effect of vibrational excitation on the halfwidth of lines in the nν2 bands of H2O,” Opt. Spectrosc. (USSR) 64, 309–312 (1988).

1974 (1)

J.-M. Flaud, C. Camy-Peyret, “The interacting states (020), (100), and (001) of H216O,” J. Mol. Spectrosc. 51, 142–150 (1974); J.-M. Flaud, C. Camy-Peyret, J.-P. Maillard, “Higher ro-vibrational levels of H2O deduced from high resolution oxygen-hydrogen flame spectra between 2800 and 6200 cm−1,” Mol. Phys. 32, 499–521 (1976); C. Camy-Peyret, J.-M. Flaud, “The interacting states (030), (110), and (011) of H216O,” J. Mol. Spectrosc. 59, 327–337 (1976); C. Camy-Peyret, J.-M. Flaud, J.-P. Maillard, G. Guelachvili, “Higher Ro-vibrational levels of H2O deduced from high resolution oxygen-hydrogen flame spectra between 6200 and 9100 cm−1,” Mol. Phys. 33, 1641–1650 (1977); and C. Camy-Peyret, J.-M. Flaud, J.-P. Maillard, “The 4ν2 band of H216O,” J. Phys. Lett. (France) 41, L23–L26 (1980).
[CrossRef]

Bykov, A. D.

A. D. Bykov, Yu. S. Makushkin, V. N. Stroinova, “Analysis of the effect of vibrational excitation on the halfwidth of lines in the nν2 bands of H2O,” Opt. Spectrosc. (USSR) 64, 309–312 (1988).

Camy-Peyret, C.

J.-Y. Mandin, J.-P. Chevillard, J.-M. Flaud, C. Camy-Peyret, “N2-broadening coefficients of H216O lines between 8500 and 9300 cm−1,” J. Mol. Spectrosc. 132, 352–360 (1988); J.-Y. Mandin, J.-P. Chevillard, C. Camy-Peyret, J.-M. Flaud, “ν2-broadening coefficients of H216O lines between 9500 and 11500 cm−1,” J. Mol. Spectrosc. 138, 272–281 (1989); J.-Y. Mandin, J.-P. Chevillard, J.-M. Flaud, C. Camy-Peyret, “ν2-broadening coefficients of H216O lines between 13500 and 19900 cm−1,” J. Mol. Spectrosc. 138, 430–439 (1989).
[CrossRef]

J.-M. Flaud, C. Camy-Peyret, “The interacting states (020), (100), and (001) of H216O,” J. Mol. Spectrosc. 51, 142–150 (1974); J.-M. Flaud, C. Camy-Peyret, J.-P. Maillard, “Higher ro-vibrational levels of H2O deduced from high resolution oxygen-hydrogen flame spectra between 2800 and 6200 cm−1,” Mol. Phys. 32, 499–521 (1976); C. Camy-Peyret, J.-M. Flaud, “The interacting states (030), (110), and (011) of H216O,” J. Mol. Spectrosc. 59, 327–337 (1976); C. Camy-Peyret, J.-M. Flaud, J.-P. Maillard, G. Guelachvili, “Higher Ro-vibrational levels of H2O deduced from high resolution oxygen-hydrogen flame spectra between 6200 and 9100 cm−1,” Mol. Phys. 33, 1641–1650 (1977); and C. Camy-Peyret, J.-M. Flaud, J.-P. Maillard, “The 4ν2 band of H216O,” J. Phys. Lett. (France) 41, L23–L26 (1980).
[CrossRef]

V. Dana, J.-Y. Mandin, C. Camy-Peyret, J.-M. Flaud, J.-P. Chevillard, R. L. Hawkins, J.-L. Delfau, “Measurements of collisional linewidths in the ν2 band of H2O from Fourier-transform flame spectra,” Appl. Opt. (to be published).

Chevillard, J.-P.

J.-Y. Mandin, J.-P. Chevillard, J.-M. Flaud, C. Camy-Peyret, “N2-broadening coefficients of H216O lines between 8500 and 9300 cm−1,” J. Mol. Spectrosc. 132, 352–360 (1988); J.-Y. Mandin, J.-P. Chevillard, C. Camy-Peyret, J.-M. Flaud, “ν2-broadening coefficients of H216O lines between 9500 and 11500 cm−1,” J. Mol. Spectrosc. 138, 272–281 (1989); J.-Y. Mandin, J.-P. Chevillard, J.-M. Flaud, C. Camy-Peyret, “ν2-broadening coefficients of H216O lines between 13500 and 19900 cm−1,” J. Mol. Spectrosc. 138, 430–439 (1989).
[CrossRef]

V. Dana, J.-Y. Mandin, C. Camy-Peyret, J.-M. Flaud, J.-P. Chevillard, R. L. Hawkins, J.-L. Delfau, “Measurements of collisional linewidths in the ν2 band of H2O from Fourier-transform flame spectra,” Appl. Opt. (to be published).

Dana, V.

V. Dana, J.-Y. Mandin, C. Camy-Peyret, J.-M. Flaud, J.-P. Chevillard, R. L. Hawkins, J.-L. Delfau, “Measurements of collisional linewidths in the ν2 band of H2O from Fourier-transform flame spectra,” Appl. Opt. (to be published).

Delfau, J.-L.

V. Dana, J.-Y. Mandin, C. Camy-Peyret, J.-M. Flaud, J.-P. Chevillard, R. L. Hawkins, J.-L. Delfau, “Measurements of collisional linewidths in the ν2 band of H2O from Fourier-transform flame spectra,” Appl. Opt. (to be published).

Flaud, J.-M.

J.-Y. Mandin, J.-P. Chevillard, J.-M. Flaud, C. Camy-Peyret, “N2-broadening coefficients of H216O lines between 8500 and 9300 cm−1,” J. Mol. Spectrosc. 132, 352–360 (1988); J.-Y. Mandin, J.-P. Chevillard, C. Camy-Peyret, J.-M. Flaud, “ν2-broadening coefficients of H216O lines between 9500 and 11500 cm−1,” J. Mol. Spectrosc. 138, 272–281 (1989); J.-Y. Mandin, J.-P. Chevillard, J.-M. Flaud, C. Camy-Peyret, “ν2-broadening coefficients of H216O lines between 13500 and 19900 cm−1,” J. Mol. Spectrosc. 138, 430–439 (1989).
[CrossRef]

J.-M. Flaud, C. Camy-Peyret, “The interacting states (020), (100), and (001) of H216O,” J. Mol. Spectrosc. 51, 142–150 (1974); J.-M. Flaud, C. Camy-Peyret, J.-P. Maillard, “Higher ro-vibrational levels of H2O deduced from high resolution oxygen-hydrogen flame spectra between 2800 and 6200 cm−1,” Mol. Phys. 32, 499–521 (1976); C. Camy-Peyret, J.-M. Flaud, “The interacting states (030), (110), and (011) of H216O,” J. Mol. Spectrosc. 59, 327–337 (1976); C. Camy-Peyret, J.-M. Flaud, J.-P. Maillard, G. Guelachvili, “Higher Ro-vibrational levels of H2O deduced from high resolution oxygen-hydrogen flame spectra between 6200 and 9100 cm−1,” Mol. Phys. 33, 1641–1650 (1977); and C. Camy-Peyret, J.-M. Flaud, J.-P. Maillard, “The 4ν2 band of H216O,” J. Phys. Lett. (France) 41, L23–L26 (1980).
[CrossRef]

V. Dana, J.-Y. Mandin, C. Camy-Peyret, J.-M. Flaud, J.-P. Chevillard, R. L. Hawkins, J.-L. Delfau, “Measurements of collisional linewidths in the ν2 band of H2O from Fourier-transform flame spectra,” Appl. Opt. (to be published).

Hawkins, R. L.

V. Dana, J.-Y. Mandin, C. Camy-Peyret, J.-M. Flaud, J.-P. Chevillard, R. L. Hawkins, J.-L. Delfau, “Measurements of collisional linewidths in the ν2 band of H2O from Fourier-transform flame spectra,” Appl. Opt. (to be published).

Makushkin, Yu. S.

A. D. Bykov, Yu. S. Makushkin, V. N. Stroinova, “Analysis of the effect of vibrational excitation on the halfwidth of lines in the nν2 bands of H2O,” Opt. Spectrosc. (USSR) 64, 309–312 (1988).

Mandin, J.-Y.

J.-Y. Mandin, J.-P. Chevillard, J.-M. Flaud, C. Camy-Peyret, “N2-broadening coefficients of H216O lines between 8500 and 9300 cm−1,” J. Mol. Spectrosc. 132, 352–360 (1988); J.-Y. Mandin, J.-P. Chevillard, C. Camy-Peyret, J.-M. Flaud, “ν2-broadening coefficients of H216O lines between 9500 and 11500 cm−1,” J. Mol. Spectrosc. 138, 272–281 (1989); J.-Y. Mandin, J.-P. Chevillard, J.-M. Flaud, C. Camy-Peyret, “ν2-broadening coefficients of H216O lines between 13500 and 19900 cm−1,” J. Mol. Spectrosc. 138, 430–439 (1989).
[CrossRef]

V. Dana, J.-Y. Mandin, C. Camy-Peyret, J.-M. Flaud, J.-P. Chevillard, R. L. Hawkins, J.-L. Delfau, “Measurements of collisional linewidths in the ν2 band of H2O from Fourier-transform flame spectra,” Appl. Opt. (to be published).

Stroinova, V. N.

A. D. Bykov, Yu. S. Makushkin, V. N. Stroinova, “Analysis of the effect of vibrational excitation on the halfwidth of lines in the nν2 bands of H2O,” Opt. Spectrosc. (USSR) 64, 309–312 (1988).

J. Mol. Spectrosc. (2)

J.-M. Flaud, C. Camy-Peyret, “The interacting states (020), (100), and (001) of H216O,” J. Mol. Spectrosc. 51, 142–150 (1974); J.-M. Flaud, C. Camy-Peyret, J.-P. Maillard, “Higher ro-vibrational levels of H2O deduced from high resolution oxygen-hydrogen flame spectra between 2800 and 6200 cm−1,” Mol. Phys. 32, 499–521 (1976); C. Camy-Peyret, J.-M. Flaud, “The interacting states (030), (110), and (011) of H216O,” J. Mol. Spectrosc. 59, 327–337 (1976); C. Camy-Peyret, J.-M. Flaud, J.-P. Maillard, G. Guelachvili, “Higher Ro-vibrational levels of H2O deduced from high resolution oxygen-hydrogen flame spectra between 6200 and 9100 cm−1,” Mol. Phys. 33, 1641–1650 (1977); and C. Camy-Peyret, J.-M. Flaud, J.-P. Maillard, “The 4ν2 band of H216O,” J. Phys. Lett. (France) 41, L23–L26 (1980).
[CrossRef]

J.-Y. Mandin, J.-P. Chevillard, J.-M. Flaud, C. Camy-Peyret, “N2-broadening coefficients of H216O lines between 8500 and 9300 cm−1,” J. Mol. Spectrosc. 132, 352–360 (1988); J.-Y. Mandin, J.-P. Chevillard, C. Camy-Peyret, J.-M. Flaud, “ν2-broadening coefficients of H216O lines between 9500 and 11500 cm−1,” J. Mol. Spectrosc. 138, 272–281 (1989); J.-Y. Mandin, J.-P. Chevillard, J.-M. Flaud, C. Camy-Peyret, “ν2-broadening coefficients of H216O lines between 13500 and 19900 cm−1,” J. Mol. Spectrosc. 138, 430–439 (1989).
[CrossRef]

Opt. Spectrosc. (USSR) (1)

A. D. Bykov, Yu. S. Makushkin, V. N. Stroinova, “Analysis of the effect of vibrational excitation on the halfwidth of lines in the nν2 bands of H2O,” Opt. Spectrosc. (USSR) 64, 309–312 (1988).

Other (2)

The small values obtained for the standard deviations tend to show that the comparisons are significant, especially for the ν2, 2ν2–ν2, and 3ν2–2ν2 bands that involve a sufficient number of common lines. Although the vibrational decrease of the collisional widths is also observed for the 4ν2–3ν2 band, the sample of transitions belonging to this band and present in the other three is too limited to permit us to make really firm conclusions.

V. Dana, J.-Y. Mandin, C. Camy-Peyret, J.-M. Flaud, J.-P. Chevillard, R. L. Hawkins, J.-L. Delfau, “Measurements of collisional linewidths in the ν2 band of H2O from Fourier-transform flame spectra,” Appl. Opt. (to be published).

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Figures (2)

Fig. 1
Fig. 1

Portion of the H2O emission flame spectrum at 2000 K. The collisional widths of the flagged lines have been measured in Ref. 1 for the ν2 band, and here for the other bands (see Tables IIV: a, ν2; b, 2ν2ν2; c, 3ν2–2ν2; d, 4ν2–3ν2; e, ν2 + ν3ν3.

Fig. 2
Fig. 2

Measured collisional widths γ in the 2ν2ν2 hot band versus the rotational quantum number J of the upper level. γ is in 10−3 cm−1. Filled circles correspond to the P, Q, and R branches of the J + τ = 0 or 1 series. Filled triangles correspond to a few lines of the J − τ = 0 or 1 series. The error bars (see Table I) have been omitted for clarity.

Tables (7)

Tables Icon

Table I Collisional Half-Widths of 2ν2ν2 Transitions Measured from Air–methane Flame Spectra at 2000 K

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Table II Collisional Half-Widths of 3ν2 − 2ν2 Transitions Measured from Air–methane Flame Spectra at 2000 K

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Table III Collisional Half-Widths of 4ν2 − 3ν2 Transitions Measured from Air–methane Flame Spectra at 2000 K

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Table IV Collisional Half-Widths of ν2 + ν3ν3, ν1 + ν2ν1, ν1ν2, and 2ν2 + ν3ν2ν3 Transitions Measured from Air–methane Flame Spectra at 2000K

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Table V Comparison of the Collisional Widths Measured for the Same Rotational Transitions Belonging to the ν2, 2ν2ν2, 3ν2 − 2ν2, and 4ν2 − 3ν2 Bandsa

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Table VI Collislonal Widths of Transitions Present Simultaneously in More Than Two Bands

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Table VII Synthesis of the Linewidth Comparisons for the Bands Involving the ν2 Vibrational Quantum Number

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