F
Partition function
F
Total angular momentum of a molecule
F t
Partition function corresponding to the translational motion
F e
Electronic partition function
F e
Nuclear partition function
F r
Partition function corresponding to the rotational motion
F v
Partition function corresponding to the vibrational motion
g
Statistical weight (degeneracy)
g
Gerade
h
Planck’s constant
ħ
Planck’s constant
H
Perturbation matrix element
b
HHamiltonian
b
H SO
Operator of spin-orbit coupling
b
H SS
Spin-spin operator
b
H OR
Orbit-rotational operator
b
H SR
Spin-rotational operator
b
H FS -
Fine-structure operator
b
H G
Gyroscopic operator
b
H HFS
Hyperfine operator
b
H MD
Magnetic-dipole operator
b
H EQ
Electric-quadrupole operator
b
H Z
Zeeman operator
b
H S
Stark operator
I
Nuclear spin
I
Nuclear spin momentum
I A
Ionization potential of species A
I
Principal moments of inertia
b I iA
Angular momentum operator
j
Total angular momentum of electron
J
Rotational quantum number
J
Total angular momentum of molecule electrons
J 0 ð~ mÞ
The incident monochromatic light intensity at wavenumber ~ m
Jð~ m; xÞ
The intensity after a light beam has traversed a distance x [cm] in the
gas medium
k
Boltzmann constant
k v
Gyroscopic predissociation rate constant
kð~ mÞ (kðkÞ) Absorption coefficient
k (k
0 )
Rate constant of a process
k ij, lm
Microscopic reaction rate constant.
k I
Rate constant of unimolecular process
xvi
Symbols