Abstract

THE equation N1/N = e-E/RT, where N1 is the number of excited atoms, N the total number of atoms, E the energy, R the gas constant, and T the absolute temperature, was applied by Dr. Loyarte and myself in the case of the absorption spectrum of tin vapour, with good agreement with experimental results (Phys. Zeit., 30, 68; 1929). In this case it is only necessary to consider the numerical values of spectral terms, because these are originated by the same electronic configuration.

Highlights

  • THERE have been published in NATURE communications by Evans (118, 51 ; 1926: 121, 351; 1928) and Constable (120, 769 ; 1927 : 123, 569 ; 1929) showing that the passivity of metals is due to a film of oxide

  • WHILE experimenting with a pair of silvered glasses, as in the Edser and Butler method of calibrating a spectroscope, I found that if the films are rotated about an axis either parallel or perpendicular to the slit of the spectroscope, a second line appears alongside each line seen and gradually moves to a point midway between each as the angle of incidence of the light is increased

  • THE equation NifN = e-E/RT, where NI is the number of excited atoms, N the total number of atoms, E the energy, R the gas constant, and T the absolute temperature, was applied by Dr Loyarte and myself in the case of the absorption spectrum of tin vapour, with good agreement with experimental results

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Summary

Introduction

WHILE experimenting with a pair of silvered glasses, as in the Edser and Butler method of calibrating a spectroscope, I found that if the films are rotated about an axis either parallel or perpendicular to the slit of the spectroscope, a second line appears alongside each line seen and gradually moves to a point midway between each as the angle of incidence of the light is increased. Ohem., 128, 321; 1927: 130, 289; 1927), investigating the state of polarisation of light reflected by mirrors of iron or nickel, which were made passive or activated by an electric current in aqueous solutions.

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