Spectroscopy of new CH3OH FIR laser lines pumped by new CO2 laser lines

1994 ◽  
Vol 72 (11-12) ◽  
pp. 1155-1164 ◽  
Author(s):  
Li-Hong Xu ◽  
R. M. Lees ◽  
K. M. Evenson ◽  
C.-C. Chou ◽  
J.-T. Shy ◽  
...  

The number of CO2 laser lines available for optical pumping of far-infrared (FIR) lasers has been significantly increased by the development of a new continuous wave (cw) CO2 laser at the Time and Frequency Division of the National Institute of Standards and Technology in Boulder, Colorado. This system operates on very high-J lines of the normal bands as well as on sequence and new hot-band lines, and has generated numerous new FIR laser transitions in CH3OH. These include the new 123 μm world-record holder, pumped by the 9HP(20) hot-band CO2 line, which is now the most efficient known FIR laser line. Assignments are given for a number of the IR pump – FIR laser energy level and transition systems, based on our high-resolution Fourier transform studies of the FIR and IR spectra of CH3OH. Features of the transition system for the 123 μm line and wave numbers for several further potential FIR laser lines are presented.

1991 ◽  
Vol 147 ◽  
pp. 440-440
Author(s):  
V.K. Khersonskii ◽  
N.V. Voshchinnikov

OH megamasers having very high luminosities in the spectral line can be effectively used for the probing of the evolutionary properties of the galaxies in the earliest cosmological epochs. The frequency shift of the emission line uniqually determines the redshift z, which tells about the epoch of emission. One of the important cosmological problems is the investigation of the galaxy mass spectrum in the expanding Universe. There is the empirical relation between the OH and far-infrared luminosities of galaxies. Therefore, if in the earliest cosmological epochs, there were galaxies with sufficient powerful infrared excesses and containing molecular material, they can be detected using the observations of their OH maser emission. The interacting and merging galaxies can be considered as the best candidates for such objects.


2008 ◽  
Vol 249 (1) ◽  
pp. 60-64 ◽  
Author(s):  
O. Baskakov ◽  
V.-M. Horneman ◽  
S. Alanko ◽  
J. Lohilahti

1996 ◽  
Vol 67 (3) ◽  
pp. 1239-1239
Author(s):  
D. Spence ◽  
G. McMichael ◽  
K. R. Lykke ◽  
J. D. Schneider ◽  
J. Sherman ◽  
...  

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