The following document lists the file abstract/MGRAY_OHFIR.abs
from catalogue VI/111.
A plain copy of the file
(without headers/trailers) may be downloaded.
Theoretical calculations of OH energy level populations under conditions relevant to star-forming regions often yield population inversions in transitions in the FIR in addition to the well known lambda doublet inversions which lead to observed OH maser action. Some OH FIR transitions have been observed but none have been observed to mase. The transitions which may be inverted according to theory, however, have not been studied. Lines which may be inverted are at 115.14, 134.83 and 135.95 microns and are all cross-stack (F2->F1) transitions in OH. Only the two longer wavelength lines are likely to be observable with ISO. The main goal of the proposal is to detect for the first time FIR laser emission from space with the LWS/Fabry-Perot system in AOT LWS04 mode. ISO is the only instrument presently available which is capable of detecting these lines.