Молекулярная спектроскопия Молекулярная спектроскопия
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Figure 10. Smoothed spectra of WD absorption cross-section from Victorova and Zhevakin (V&Zh) [75], Scribano and Leforestier (S&L) [12] and Lee et al. [13] for temperatures around 296°K. The MTCKD [15] continuum model and empirical self-continuum of Burch [45] are also presented for comparison: (A) mm-wave region and (B) mid-to-far infrared spectral regions. The dashed lines in (B) show ratios (right hand axis) of the S&L and Lee et al. calculated spectra to the experimental continuum [45] (above 340 cm-1) and to the MTCKD-1.3 model (below 340cm-1). The equilibrium constant used by S&L: Keq,S&L(~296 K)=0.05 atm-1, is adopted here to represent WD absorption cross-section for all three works. This causes the cross-section curve from Lee et al. to be a factor 1.86 lower than in the original work. The absorption in dB/km from V&Zh and S&L is converted to cm2 molec-1 atm-1 units using formula: 2:3026 x 10-6 [dB/km]* T *Keq,S&L/ (273.15* NA* PWD), where NA=2.687x1019 molec cm-3; T~296°K; PWD is WD partial pressure (atm) assumed in the particular work:8x10-6 in V&Zh and 2.2x10-5 in  S&L. The implicit term Keq, S&L/Keq (where Keq is equilibrium constant applied for calculation in particular work) is used in the formula above to bring different calculations to similar conditions.

[12] Scribano Y., Leforestier C. Contribution of water dimers absorption to the millimeter and far infrared atmospheric water continuum. J. Chem. Phys., 2007; 126: 234301.
[13] Lee M.-S., Baletto F., Kanhere D.G., Scandolo S. Far-infrared absorption of  water clusters by first-principles molecular dynamics. J. Chem. Phys., 2008; 128: 214506.
[15] MTCKD Available from web-site: /http:// rtweb.aer.com/ continuum_frame.htmlS.
[45] Burch D. Continuum absorption by H2O, Air Force Geophysics Laboratory report,AFGL-TR-81-0300, Hanscom AFB, MA,1981.
[75] Viktorova A.A., Zhevakin S.A. Microradiowave absorption by dimers of atmospheric water vapor. Sov. Phys. Dokl., 1970; 15:852–855.

INTAS grants 00-189, 03-51-3394, гранты РФФИ 02-07-90139, 05-07-90196, 08-07-00318, 13-07-00411