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Spectroscopy of Matrices and Thin Films with an Integrating Sphere

Volume 43, Number 2 (Feb. 1989) Page 320-324

Berger, E.; Griffith, D.W.T.; Schuster, G.; Wilson, S.R.


The paper describes a novel experimental approach to improving sensitivity to weak absorption in matrix isolation and thin film spectroscopy. The matrix or film is grown on the surface of an integrating sphere, in which the multiply reflected light correspondingly multipasses the sample film. The quantitative photometric behavior of the sphere is satisfactorily described by extending standard theory. Enhancement of absorption by a factor of at least 20 is possible and is demonstrated. The sphere has a number of useful advantages over other multipass techniques, particularly in matrix isolation spectroscopy.