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preface to fifteenth edition

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2.18 SECTION 2<br />

TABLE 2.2<br />

Physical and Chemical Symbols and Definitions (Continued)<br />

L. Spectroscopy<br />

Name Symbol SI unit Definition<br />

Asymmetry parameter <br />

2B A C<br />

A C<br />

Centrifugal dis<strong>to</strong>rtion constants:<br />

A reduction J JK K J K m 1<br />

S reduction D J D JK D K d 1 d 2<br />

Degeneracy, statistical g, d, <br />

weight<br />

Electric dipole moment of a p, C·m E p p E<br />

molecule<br />

Electron spin resonance<br />

(ESR), electron paramagnetic<br />

resonance (EPR):<br />

Hyperfine coupling constant:<br />

In liquids a, A Hz Ĥ hfs /h aŜ I<br />

In solids T Hz Ĥ hfs /h Ŝ T I<br />

g fac<strong>to</strong>r g h g B B<br />

Electronic term T e m 1 T e E e /hc<br />

Harmonic vibration wavenumber<br />

e ; r m 1<br />

Inertial defect kg · m 2 I C I A I B<br />

Intera<strong>to</strong>mic distances:<br />

Equilibrium distance r e m<br />

Ground state distance r 0 m<br />

Substitution structure distance<br />

r s<br />

m<br />

Zero-point average distance<br />

r z<br />

m<br />

Longitudinal relaxation T 1<br />

s<br />

time<br />

Nuclear magnetic resonance 10 6 ( 0 )/ 0<br />

(NMR), chemical shift, <br />

scale<br />

Coupling constant, direct D AB<br />

Hz<br />

(dipolar)<br />

Magne<strong>to</strong>gyric ratio C·kg 1 2/Ih<br />

Shielding constant A B A (1 A )B<br />

Spin-spin coupling constant<br />

J AB Hz H/h J AB I A · I B<br />

Principal moments of inertia<br />

I A ; I B ; I C kg · m 2 I A I B I C<br />

Rotational constants:<br />

In frequency A; B; C Hz A h/8 2 I A<br />

In wavenumber Ã; B˜ ; C˜ m 1 Ã h/8 2 I A<br />

Rotational term F m 1 F E rot /hc<br />

Spin orbit coupling constant A m 1 T s.o. A L˜ · S˜ <br />

Total term T m 1 T E <strong>to</strong>t /hc<br />

Transition dipole moment<br />

M, R C·m M <br />

p d<br />

of a molecule

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