Far-infrared laser system for detection of defects in polyethylene-insulated power cables

1978 ◽  
Vol 2 (2) ◽  
pp. 42 ◽  
Author(s):  
P. K. Cheo
Keyword(s):  
Laser System ◽  
Far Infrared ◽  
Infrared Laser ◽  
Power Cables ◽  
Far Infrared Laser ◽  
Detection Of Defects

Submillimetre-wave lines of H 2 D + and D 2 H + as probes into chemistry in cold dark clouds

2006 ◽  
Vol 364 (1848) ◽  
pp. 2943-2952 ◽  
Author(s):  
Takayoshi Amano
Keyword(s):  
Recent Progress ◽  
Laser System ◽  
Far Infrared ◽  
Infrared Laser ◽  
Effective Hamiltonian ◽  
Dark Clouds ◽  
Far Infrared Laser ◽  
Spectroscopic Investigations ◽  
Thz Range ◽  
Submillimetre Wave

We discuss past and recent progress of our continuing project of submillimetre-wave spectroscopic investigations of H 2 D + and D 2 H + . Three new lines of H 2 D + in the 2.5–3.5 THz range are measured with a tunable far-infrared laser system. Since these molecules are very light asymmetric molecules, analysis based on a conventional effective Hamiltonian is not very useful in predicting the transition frequencies to the accuracy of the order of several MHz or better. In this respect, any addition of new accurate measurements of transition frequencies is important. In this paper, some discussions will be made on and its deuterated species as probable interstellar species in cold dark clouds. In particular, , which is predicted to be abundant in cold dark clouds, can be (indirectly) detected by observing .

Measurement of Far‐Infrared Laser Power

1969 ◽  
Vol 40 (2) ◽  
pp. 359-360 ◽  
Author(s):  
S. J. Martinich ◽  
C. J. Johnson ◽  
D. P. Akitt
Keyword(s):  
Laser Power ◽  
Far Infrared ◽  
Infrared Laser ◽  
Far Infrared Laser
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