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[en] We have detected the S(9), v = 0→0, J = 11→9 line of H2 in the molecular-hydrogen emission region in Orion. The line is much weaker ( x 6) than expected from level populations at the previously determined excitation temperature of 2000 K in the shock region. Nonthermal excitation or anomalous extinction in the 4--5 mm region is suggested by this observation. The observed line frequency of 2130 +- 1 cm-1 provides a new evaluation of the third-order rotation constant, H0 = (3.970 +- 0.070) x 10-5
Journal
Astrophysical Journal, Letters to the Editor; ISSN 0571-7248; 
; v. 242(3); p. L183-L186
; v. 242(3); p. L183-L186