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The high-resolution proton magnetic resonance spectrum of the four protons attached to the heterocyclic rings of N-benzylthieno[3,2-b]pyrrole (I) has been examined in detail at 16.2 Mc/sec. The spectr...
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By suitable modifications of the general equations given previously [W. A. Steele and M. Ross, J. Chem. Phys. 33, 464 (1960)], a theoretical monolayer adsorption isotherm is given which is written as ...

Photoionization of Ce3+ in Glass

J. Chem. Phys. 35, 844 (1961); doi:10.1063/1.1701227

Issue Date: September 1961

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Jackson S. Stroud
Corning Glass Works, Corning, New York
The photoionization of Ce3+ is investigated by determining the optical absorption changes and the electron spin resonance changes that occur when cerium-containing silicate glasses are illuminated with ultraviolet light. The results are: (1) The room temperature quantum yield of photoelectrons from Ce3+ is 0.1. (2) The optical absorption and the electron spin resonance bands caused by trapped photoelectrons are found. (3) A Ce3+ ion from which a fourth electron has been removed by photoionization is different from a Ce4+ ion. ©1961 American Institute of Physics
History: Received January 19, 1961
Permalink: http://link.aip.org/link/?JCPSA6/35/844/1
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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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REFERENCES (9)
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  1. S. D. Stookey, Ind. Eng Chem. 41, 856 (1949).
  2. S. D. Stookey and F. W. Schuler, in Travaux du IVe Congrès International du Verre. (Imprimerie Chaix, Paris, 1957), pp. 390–395.
  3. A. Kats and J. M. Stevels, Philips Research Repts. 11, 115 (1956).
  4. M. Lax, Photoconductivity Conference, edited by R. G. Breckenridge et al. (John Wiley & Sons, Inc., New York, 1956), p. 127.
  5. If an ion in some host material can exist in two different states both of which have optical absorption bands, then the total absorption coefficient is alpha = n3sigma3+n4sigma4. n3 and n4 are the concentrations of the ion in the two states. The sigma's are the absorption cross sections. The total concentration of ions is n = n3+n4. Substituting this equation into the expression for alpha gives alpha = nsigma3+n4(sigma4−sigma3). If the absorption bands of the two states overlap, there will, in some cases, be a wavelength such that sigma4 = sigma3; alpha = nsigma3. At this wavelength alpha depends only on n. It is independent of the relative populations of the two states. The absorption curves obtained by holding n constant and by varying n3/n4 all pass through one point at this wavelength. This point is the isosbestic point.
  6. W. W. Wargin and G. O. Karapetjan, Glastech. Ber. 32, 443 (1959).
  7. The half-width used here is the energy difference between the absorption maximum and the long wavelength point where the absorption is half the maximum.
  8. J. S. van Wieringen and A. Kats, Philips Research Repts. 12, 432 (1957).
  9. M. Tashiro, N. Soga, and S. Sakka, J. Ceram. Assoc. Japan 68, 169 (1960).

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