The CH Molecule
Last Modified:
JeffMangum
- 02 January 2016
Table of Contents:
Energy Levels
2P(1/2), J=1/2, F=1-1, N=1
2P(1/2), J=3/2, F=2-2, N=1
2P(1/2), J=5/2, F=3-3, N=2
2P(1/2), J=3/2, F=2-2, N=2
References:
Energy Levels
2P(1/2), J=1/2, F=1-1, N=1
Energy above ground =~ 0 cm^(-1)
Frequency =~ 3300 MHz
Thought to be inverted by IR excitation (see references below)
Not accessible at GBT (falls between S- and C-band)
Is accessible at VLA (S-band)
2P(1/2), J=3/2, F=2-2, N=1
Energy above ground =~ 17.9 cm^(-1)
Frequency =~ 700 MHz
LTE excitation (i.e. not inverted by IR; see Ziurys & Turner 1985)
Accessible at GBT (at prime focus) but not VLA
2P(1/2), J=5/2, F=3-3, N=2
Energy above ground =~ 73.15 cm^(-1)
Frequency =~ 4800 MHz
2P(1/2), J=3/2, F=2-2, N=2
Energy above ground =~ 67 cm^(-1)
Frequency =~ 7300 MHz
References:
Radio Observations of Interstellar CH. I.
: Survey of CH done at Onsala not long after its discovery. Lots of good basic information on the molecule.
Radio Astronomical Determination of Ground State Transition Frequencies of CH
: Ground state frequency determination from observations not long after discovery in 1973.
Radiofrequency Emission from CH in Comet Kohoutek (1973f)
: Detected ground-state in a comet. N(CH) =~ 4x10^(14) cm^(-2).
Detection of Interstellar Rotationally Excited CH
: Detection of the first rotationally excited state of CH.
Rotationally Excited Interstellar CH: Detection of Satellite Lines and Analysis of Abundance and Excitation
: Measurements of the 2P(1/2), J=3/2 (first rotationally-excited) state of CH. As you would expect from a Turner paper, lots of useful information on molecular structure and excitation.
The Detection of Interstellar CH in Galaxies
: Detection of ground-state (3300 MHz) CH in three (and maybe a fourth) galaxies (LMC, NGC4945, NGC5128, and possibly NGC253).
--
JeffMangum
- 2016-01-02
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