Abstract

Displacement of the air from the optical path of a Beckman IR2T spectrophotometer by helium was found to result in an increase in the current of the Nernst glower and a displacement of the wavelength calibration of the instrument. The former was attributable to the greater thermal conductivity of helium, while the latter resulted from its lower index of refraction. It was found possible to evaluate the refractive index of other gases from the observed displacements in the wavelength calibration of the instrument.

© 1953 Optical Society of America

An Attachment to Permit the Examination of Liquid Films by a Beckman Model DU Spectrophotometer

H. G. McAdie and R. V. V. Nicholls
J. Opt. Soc. Am. 43(9) 767-768 (1953)

Measurement of Fluorescent Spectra of Liquids with a Modified Beckman DU Spectrophotometer*

Frank B. Huke, Robert H. Heibel, and Velmer A. Fassel
J. Opt. Soc. Am. 43(5) 400-404 (1953)

The Calibration of Infrared Prism Spectrometers

A. R. Downie, M. C. Magoon, Thomasine Purcell, and Bryce Crawford
J. Opt. Soc. Am. 43(11) 941-951 (1953)

Transmission Measurements with the Beckman Quartz Spectrophotometer

Kasson S. Gibson and Margaret M. Balcom
J. Opt. Soc. Am. 37(8) 593-608 (1947)

An Evaluation of Two Simple Methods for Calibrating Wavelength and Absorbance Scales of Modern Spectrophotometers

Lawrence J. Heidt and David E. Bosley
J. Opt. Soc. Am. 43(9) 760-766 (1953)