M(t À t 0 ) Memory function
l
Mobility or dipole moment (see context)
n; j
Real and imaginary parts of the complex index of refraction
n
Concentration (general)
n Æ
Concentration of intrinsic ions of water
n w
Concentration of neutral water molecules
N A
Avogadro number (N A = 6.022Á10
23 mol
À1 )
m
Frequency
m D1 , m D2
Frequency of the first and the second Debye relaxations
g
Coefficient of viscosity
x
Circular frequency (x = 2pm)
X 0 , x 0
Eigenfrequencies
r c
Crystallographic ionic radius
q
Density
r(x)
Real part of the complex conductivity (r =
00
0 x)
r dc
Direct current (static) electrical conductivity
r D1 , r D2 High-frequency conductivity of the first and the second relaxations
q
Charge
T
Temperature
t, s
Time
t w
Lifetime of water molecule
t Æ
Lifetime of ionic species
s r
Relaxation time
s c
Transition time
s D1 , s D2
Characteristic time of the first and the second relaxations
U
Potential
V
Voltage
f
Chemical potential
xviii
Notation