Table A.2 Useful conversion factors
Plane angle
1 degree
17.45 mrad
1.745 Â 10
À2 rad
60 arcmin
3600 arcsec
57.296 degree
1000 mrad
1 radian
3437.7 arcmin 2.0626 Â 10
5 arcsec
0.057296 degree
1 mrad
10
À3 rad
3.4377 arcmin 2.0626 Â 10
2 arcsec
2.778 Â 10
À4 degree 4.848 Â 10
À3 mrad 4.848 10
À6 rad
0.01667 arcmin 1 arcsec
Energy
a
1 eV
1.2398 Â 10
4 Å
8.0656 Â 10
3 cm
À1 1.1605 Â 10
4 K 96.486 kJ mol
À1
12.398 keV
1 Å
1 Â 10
8 cm
À1
1.4388 Â 10
8 K 1.1963 Â 10
6 kJ mol
À1
1.2398 Â 10
À4 eV
10
8 Å
1 c m
À1
1.4388 K
0.011963 kJ mol
À1
8.6173 Â 10
À5 eV
1.4388 Â 10
8 Å
0.69503 cm
À1
1 K
8.3145 Â 10
À3 kJ mol
À1
0.010364 eV
1.1963 Â 10
6 Å
83.593 cm
À1
120.27 K
1 kJ mol
À1
a
Units are obviously not dimensionally equivalent; “K” is kelvin, calculated by “temperature ¼ (photon energy)/
(Boltzmann constant)”
314
Appendix A: Fundamental Constants and Useful Conversion Factors