THE PURE ROTATIONAL RAMAN SPECTRUM OF CYCLOPENTANE$^{\ast}$

Tanner, Kurt; Weber, A.

THE PURE ROTATIONAL RAMAN SPECTRUM OF CYCLOPENTANE$^{\ast}$

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1962-K-09.jpg (153.84 KB)

Date

1962

Authors

Tanner, Kurt

Weber, A.

Publisher

Ohio State University

Abstract

The pure rotational Raman spectra of $C 5 H 10$ and $C 5 H 10$ were photographed in the 13-th order of a 300 groove mm plane grating using Hg 4358 {\AA} as the exciting line. The spectra are quite weak and diffuse. The line spacing in the S-branches is nearly constant with a value of about $0.864 c m −1 (C 5 H 10)$ and $0.644 c m −1 (C 5 H 10)$ . Transitions with J up to 67 in the ordinary and up to 76 in the deuterated compound were observed in the S-branch. A number of R-branch lines were also observed. The analysis of the spectra is based upon the symmetric rotor theory and yields the rotational constants

Description

C 5 H 10 : B o =0.2160 5 ±0.00010 c m −1 D o =(5.0±1.4)×10 −8 c m −1 C 5 D 10 : B o =0.1610 3 ±0.00013 c m −1 D o =(4.0 / p m 2.3)×10 −8 c m −1 $ $ A s s u m i n g a p l a n a r m o d e l f o r t h e c a r b o n r i n g ($ D 3 h $ p o i n t g r o u p) t h e l e n g t h o f t h e C − C b o n d i s $ r C − C =1.537 3 ±0.002 \AA $ i n g o o d a g r e e m e n t w i t h t h e e l e c t r o n d i f f r a c t i o n v a l u e o f $ 1.54 \AA 1 $ . T h e c y c l o p e n t a n e m o l e c u l e i s n o t, h o w e v e r, a s t r i c t s y m m e t r i c t o p a s i s s h o w n b y a c a r e f u l a n a l y s i s o f t h e t h e r m o d y n a m i c $ f u n c t i o n s 2 $ a n d t h e v i b r a t i o n a l $ s p e c t r u m . 3 $ T h e p r e s e n t s t u d y d o e s n o t a d m i t a n y c h o i c e b e t w e e n t h e p e r m i s s i b l e $ C 2, C . $, a n d $ C 1 $ s y m m e t r i e s .

Author Institution: Physics Department, Fordham University

URI

http://hdl.handle.net/1811/14457

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Abstracts of OSU International Symposium on Molecular Spectroscopy 1960-1969

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