The Complex Molecular Absorption Line System atz= 0.886 toward PKS 1830−211

1998 ◽  
Vol 500 (1) ◽  
pp. 129-137 ◽  
Author(s):  
Tommy Wiklind ◽  
Francoise Combes
Keyword(s):  
Absorption Line ◽  
Molecular Absorption ◽  
Line System

Submegahertz frequency stabilization of a terahertz quantum cascade laser to a molecular absorption line

2010 ◽  
Vol 96 (7) ◽  
pp. 071112 ◽  
Author(s):  
H. Richter ◽  
S. G. Pavlov ◽  
A. D. Semenov ◽  
L. Mahler ◽  
A. Tredicucci ◽  
...  
Keyword(s):  
Absorption Line ◽  
Quantum Cascade Laser ◽  
Frequency Stabilization ◽  
Molecular Absorption ◽  
Quantum Cascade

scholarly journals Limits on the Variation of Physical Constants Derived from Molecular Absorption Lines

1999 ◽  
Vol 183 ◽  
pp. 167-167 ◽  
Author(s):  
T. Wiklind ◽  
F. Combes
Keyword(s):  
Absorption Line ◽  
High Redshift ◽  
Absorption Lines ◽  
Frequency Resolution ◽  
Radio Lines ◽  
Molecular Absorption ◽  
Diagnostic Application ◽  
Physical Constants ◽  
Resonance Transitions ◽  
Electronic Resonance

A potential diagnostic application of molecular rotational absorption lines at high redshift is to test the invariance of physical constants. This can be done by comparing the observed redshifted frequency of a molecular absorption line with redshifted lines from other types of transitions such as the 21cm hyperfine transition or electronic resonance transitions. In order to set stringent limits, it is necessary to achieve the greatest possible frequency resolution. This makes radio lines well suited for this purpose.

Frequency locking an HCN laser to a molecular absorption line

1971 ◽  
Vol 7 (13) ◽  
pp. 381 ◽  
Author(s):  
C.C. Bradley ◽  
D.J.E. Knight ◽  
C.R. McGee
Keyword(s):  
Absorption Line ◽  
Molecular Absorption ◽  
Frequency Locking ◽  
Hcn Laser

scholarly journals The Milky Way halo as a QSO absorption-line system

2013 ◽  
Vol 550 ◽  
pp. A87 ◽  
Author(s):  
P. Herenz ◽  
P. Richter ◽  
J. C. Charlton ◽  
J. R. Masiero
Keyword(s):  
Absorption Line ◽  
Milky Way ◽  
Line System ◽  
Milky Way Halo
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