Abstract

It is shown that first-order changes in the normal modes of vibration of a polyatomic molecule do not alter the normal frequencies except in second or higher order. This fact provides a convenient method of obtaining the best fit between the observed and calculated frequencies by adjusting the potential constants and also of ascertaining the relative importance of each constant in its effect on the spectrum. It further emphasizes, however, the well-known difficulties in obtaining reliable potential functions and shows that very considerable errors may occur in the determination of the potential and of the normal modes.

© 1960 Optical Society of America

Repulsive Potential between Nonbonded Methyl Groups

John Overend and James R. Scherer
J. Opt. Soc. Am. 50(12) 1203-1207 (1960)

Measurements on Higher J Rotational Lines of Vibration Rotation Bands and Study of Resonances in Linear Polyatomic Molecules. I. ν₂ and 2ν₂⁰ Bands of HC¹²N†

W. W. Brim, J. M. Hoffman, H. H. Nielsen, and K. Narahari Rao
J. Opt. Soc. Am. 50(12) 1208-1213 (1960)

Multifilter Method for Determining Relative Spectral Sensitivity Functions of Photoelectric Detectors

Günter Wyszecki
J. Opt. Soc. Am. 50(10) 992-998 (1960)

Standing Potentials of the Frog’s Eye*

Ernest Dzendolet
J. Opt. Soc. Am. 50(6) 551-555 (1960)

Infrared Band Assignments for the 2900 cm⁻¹ Region Methyl Group Vibrations in XC₆H₄COOCH₃, XC₆H₄CH₃, and XC₆H₄COCH₃ Molecules

Marie-Thèrèse Forel, Nelson Fuson, and Marie-Louise Josien
J. Opt. Soc. Am. 50(12) 1228-1231 (1960)