Millimeter Wave Spectra of Sb $H_{3}$ and Sb $D_{3}$

The

J = 0 \to 1

rotational transitions of normal and deuterated stibine have been measured in the shorter millimeter wave region. The

B_{0}

values obtained are, in Mc/sec: 88 031.9 for

{Sb}^{121}

H_{3}

, 88 015.5 for

{Sb}^{123}

H_{3}

{Sb}^{123}

H_{3}

, 44 693.3 for

{Sb}^{121}

D_{3}

, and 44 677.1 for

{Sb}^{123}

D_{3}

. The observed Sb nuclear quadrupole couplings,

eQq

, differ for the normal and deuterated forms of stibine and are, in Mc/sec: for

{Sb}^{121}

, 458.7±0.8 in Sb

H_{3}

, and 465.4±0.8 in Sb

D_{3}

; for

{Sb}^{123}

, 586.0±0.8 in Sb

H_{3}

, and 592.8±0.8 in Sb

D_{3}

. These couplings lead to the ratio

\frac{Q^{123}}{Q^{121}} = 1.275 \pm 0.003

. The Sb nuclear quadrupole moments are estimated to be:

Q^{121} = - 0.8 \times 10^{- 24}

{cm}^{2}

Q^{123} = - 1.0 \times 10^{- 24}

{cm}^{2}

. Significant Sb nuclear magnetic coupling was observed for the normal stibine. In Sb

H_{3}

the magnetic coupling constant is found to be 0.33 Mc/sec for

{Sb}^{121}

and 0.18 Mc/sec for

{Sb}^{123}

. The ratio of these,

\frac{C^{121}}{C^{123}} = 1.84

, is in good agreement with the known ratio of the nuclear

g

factors,

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Millimeter Wave Spectra of SbH3and SbD3