Information one might need sometimes.


Some numbers

k=1.38044 10-16 erg K-1
h=6.626176 10-27 erg s
c=2.997925 10+10 cm s-1
1D = 1 10-18 esu = 1 10-18 g0.5 cm2.5 s-1
1 cm-1 = 1.43880 K


Dipole moments and references for collision rates

Molecule mu(D) Collision with
CO 0.1098 Tiemann 1982 para H2 Flower, Launay 1985
CS 1.96 Lovas, Krupenie 1974 para H2 Green, Chapman 1978
HCN 2.98 Tiemann 1982 He Green, Thaddeus 1974
HNC 2.99 Saykally 1976
CN 1.45 Thomson, Dalby 1968
C2H 0.80 Tucker et al. 1974
N2H+ 3.40 Green et al. 1974 He Green 1975
HCO+ 4.07 Woods et al. 1975
HC3N 3.72 Lafferty et al. 1978 He Green, Chapman 1978
SO 1.55 Tiemann 1974 H2 Green 1994
CH3CCH 0.78 Bauer et al. 1979 H2 Green 1986
CH3OH 0.896 Tiemann 1982 H2 Menten et al. 1988
(from Pratap et al., 1997, ApJ 486, 862)
CH 0.887
OH 1.67
SiO 3.10
OCS 0.715
CH3CN 3.92
HC5N 4.33
NH3 1.47
H2CO 2.33
SO2 1.63
H2SO4 2.74


CO carbonmonoxide frequencies.

CO 13CO C18O C17O 13C18O 13C17O
1-0 115.2712051 110.2013541 109.7821734 112.3592837 104.7114035 107.2889525
2-1 230.5380016 220.3986765 219.5603568 224.7143850 209.4191594 214.5740812
3-2 345.7959906 330.5879601 329.3305453 337.0611298 314.1196632 321.8515036
4-3 461.0407652 440.7651668 439.0887631 449.3953412 418.8092549
5-4 576.2679131 550.9263029 548.8309775 561.7127845 523.4843172
6-5 691.4730763 661.0672801 658.5532728 674.0093443
7-6 806.6518060 771.1841376 768.2515890 786.2808166
8-7 921.7997000 881.2728339 877.9219561 898.5230217


Other parameters of CO

B0 (MHz) reference
CO 57635.9693 Winnewisser M., Winnewisser B.P., Winnewisser G.,
13CO 55101.0098 1985, In: G.H.F. Diercksen et al. (eds), Molecular
C18O 54891.4212 Astrophysics. Reidel. p. 375
C17O 56179.9892
13C18O 52356.0022
13C17O 53644.7928

Dipole moment reference
CO 0.1098D Tiemann E., 1982, In: Hellwege K.-H., Hellwege A.M.
13CO 0.1102D (eds.) Landolt-B\"ornstein II/14a.
C18O 0.1102D Springer-Verlag, Berlin. p. 584


12CO Energy levels and collision rates

J K Aij Cij(10K) nc Cij(60K) nc
s-1 cm3s-1 cm-3 cm3s-1 cm-3
1 5.533 1-0 7.22 10-8 2.3 10-11 3.1 103 4.1 10-11 1.8 103
2 16.599 2-1 6.93 10-7 2.8 10-11 2.4 104 6.0 10-11 1.2 104
3 33.197 3-2 2.50 10-6 2.5 10-11 1.0 105 7.0 10-11 3.6 104
4 55.328 4-3 6.16 10-6 3.2 10-11 1.9 105 7.6 10-11 8.1 104
5 82.989 5-4 1.23 10-5 4.0 10-11 3.1 105 7.6 10-11 1.6 105
6 116.180 6-5 2.16 10-5 5.1 10-11 4.2 105 8.5 10-11 2.5 105
7 154.899 7-6 3.46 10-5 7.5 10-11 4.6 105 9.2 10-11 3.8 105
8 199.146 8-7 5.21 10-5 4.5 10-11 1.2 106 9.2 10-11 5.7 105
Collision rates CO - para H2 J=0-11 and CO - ortho H2 J=0-6
Flower D.R., Launay J.M., 1985, MNRAS 214, 271


C Carbon frequencies

12C 13C rel. int. reference
3P1 - 3P0 492.160651 492.164276 (F=3/2-1/2) Yamamoto S., Saito S., 1991,
492.16015 (F=1/2-1/2) ApJ 370, L103
3P2 - 3P1 809.34197 809.1255 (F=3/2-1/2) 33.3 Klein H., et al., 1998,
809.1213 (F=3/2-3/2) 6.7 ApJ 494, L125
809.4937 (F=5/2-3/2) 60.0

12C energy levels
J K
1 23.624
2 62.473


Molecules probing densities. (N.J. Evans II, ARAA 1999)

Molecule Transition Frequency Eup nc(10K) neff(10K) nc(100K) neff(100K)
GHz K cm-3 cm-3 cm-3 cm-3
CS J=1-0 48.9909780 2.4 4.6 104 7.0 103 6.2 104 2.2 103
CS J=2-1 97.9809500 7.1 3.0 105 1.8 104 3.9 105 4.1 103
CS J=3-2 146.9690330 14 1.3 106 7.0 104 1.4 106 1.0 104
CS J=5-4 244.9356435 35 8.8 106 2.2 106 6.9 106 6.0 104
CS J=7-6 342.8830000 66 2.8 107 ... 2.0 107 2.6 105
CS J=10-9 489.7510400 129 1.2 108 ... 6.2 107 1.7 106
HCO+ J=1-0 89.1885280 4.3 1.7 105 2.4 103 1.9 105 5.6 102
HCO+ J=3-2 267.5576190 26 4.2 106 6.3 104 3.3 106 3.6 103
HCO+ J=4-3 356.7342880 43 9.7 106 5.0 105 7.8 106 1.0 104
HCN J=1-0 88.6318473 4.3 2.6 106 2.9 104 4.5 106 5.1 103
HCN J=3-2 265.8861800 26 7.8 107 7.0 105 6.8 107 3.6 104
HCN J=4-3 354.5054759 43 1.5 108 6.0 106 1.6 108 1.0 105
H2CO J=212-111 140.8395020 6.8 1.1 106 6.0 104 1.6 106 1.5 104
H2CO J=313-212 211.2114680 17 5.6 106 3.2 105 6.0 106 4.0 104
H2CO J=414-313 281.5269290 30 9.7 106 2.2 106 1.2 107 1.0 105
H2CO J=515-414 351.7686450 47 2.6 107 ... 2.5 107 2.0 105
NH3 (1,1) 23.6944955 1.1 1.8 103 1.2 103 2.1 103 7.0 102
NH3 (2,2) 23.7226333 42 2.1 103 3.6 104 2.1 103 4.3 102

Last modified: