Symbols
Latin
A
Pre-exponential factor
A nm
Einstein spontaneous emission coefficient
A
el
1,2
Electronic matrix element of the interaction of the states 1, 2
A el
Electronic matrix element of the interaction
b
Impact parameter
B e
Rotational constants for a v = 0 vibrational level
B v
Rotational constants for a v 6 ¼ 0 vibrational level
B mn
Einstein absorption coefficient
B nm
Einstein stimulated emission coefficient
c
C oncentration
c
Light velocity in vacuum
C
Heat capacity
C 1,2
Mixing coefficient of the states W 1 (J) and W 2 (J)
d
Gas-kinetic diameter
D
Debye
D e
Potential energy depth
D 0
Binding energy of the lowest van der Waals level
D 0
Dissociation energy for the v = 0 vibrational level
e
Electron (elementary) charge
E
Energy
E
el
k
Energy of the k-th electronic state
E a
Activation energy
E SO
Spin-orbit splitting
DE
Change of energy
eV
Electron-volt
f
Oscillator strength
f A (u A )
Velocity distribution function of species A
xv