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Microwave spectrum; pentafluorobenzene; dipole moment

With the idea of evaluating the dipole moment of pentafluorobenzene from a lowJ transition, its microwave spectrum was investigated in the frequency region of 8,000 to 12,400 MHz. The spectrum had been earlier observed by the authors in the 12,400 to 18,000 MHz region which needs reassignment in the light of present investigations. The rotational constants areA=1480·856±0·003 MHz,B=1030·066±0·003 MHz andC=607·496±0·002 MHz. The dipole moment is 1·44±0·05 D.

S Doraiswamy¹ S D Sharma¹

1. Tata Institute of Fundamental Research, Bombay - 400005

Published

April 1974

Manuscript received

1 October 1973

Manuscript revised

28 January 1974