Index of /saw/website_data/analytic_fits

[ICO]NameLast modifiedSizeDescription

[PARENTDIR]Parent Directory   -  
[TXT]h2_levels_in.txt 2016-04-19 17:48 11K 
[TXT]h2h_decal1_fit.txt 2016-04-19 17:48 151K 
[TXT]hd_levels_in.txt 2016-04-19 17:48 4.8K 
[TXT]hhd_decal1_fit.txt 2016-04-19 17:48 362K 
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Analytic fits to the non-reactive rate coefficients

Analytic fits to the non-reactive rate coefficients

The functional fit to the rate coefficients for collisional de-excitation takes the form

\begin{displaymath}log _{10}[q(vJ \rightarrow v'J') {\mathrm cm}^3 {\mathrm s}^{-1}] = a + b/t +
c/t^2 \; ,\end{displaymath}

where $t = (T(K)/10^3) + \delta t$, and a value of $\delta t = 1$ was adopted in all the fits. This last parameter prevents divergence of the rate coefficients as $t \rightarrow 0$.

Files are included for de-excitation of para-H2 and ortho-H2 (merged into a single file) by H, and HD by H; these files are called, respectively, h2h_decal1_fit.txt , and hhd_decal1_fit.txt   In each file, the first line specifies the total number of transitions.  Subsequent lines contain, in 5 successive columns: an index identifying the initial (upper) state; an index identifying the final (lower) state; value of a; value of b; value of c.  The ordering (and identification) of the levels is according to energy, commencing with the lowest J=0, v=0 state of H2 or HD.  The energetic ordering of the pairs of values of (J,v) is to be found in the files: h2_levels_in.txt and hd_levels_in.txt