By R.K. Willardson and Albert C. Beer (Eds.)
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Sample text
The requirement for low ripple and fluctuations in the lamp output makes electroreflectance measurements in the vacuum ultraviolet presently difficult, since most lamps in this spectral region are of the gas discharge type and are ac operated. The optical requirements are modest. Except in low-temperature excitonic spectra, the line width ofelectroreflectance spectra, although sharper than in any other version, is still not limited by the resolution of a prism monochromator. In early studies, lifetime broadening was assumed to explain an observed widening of structure toward the ultraviolet.
Seraphin, Bull. Amer. Phvs. Sac. 13,428 (1968). R. A. Forman and M. Cardona, in “11-VI Semiconducting Compounds” (Proc. 1967 Int. , Providence) (D. G. ),p. 100. Benjamin, New York and Amsterdam, 1967. 6 5 G. Weiser and J. Stuke, Proc. IX In!. Conf. Phys. , Moscow, 1968, Vol. 1 , p. 228, Publishing House “Nauka,” Leningrad, 1968; Phys. Status Solidi 35. 747 (1969). 6b H . R. Philipp, W. C. Dash, and H. Ehrenreich, Phys. Rev. 127, 762 (1962). ” U. Gerhardt, Phys. Lett. 9, 117 (1964). U . Gerhardt, Phys.
C. B. Duke, Phys. Rev. Lett. 15, 625 (1965). 3 1 C. B. Duke and M . E. Alferieff, Phys. Rev. 145,583 (1966). 32 H. I. Ralph, J. Phys. C,Proc. Phys. Soc. (London) 1,378 (1968). 3 3 Ch. Gahwiller and G. Harbeke, Bull. Amer. Phys. Soc. 13, 387 (1968). 29 1. ELECTROREFLECTANCE 33 the characteristic differences of the modulated version. First, the sample holder carries some provision to modulate a specific parameter in the reflecting surface. And second, the modulation thereby impressed onto the reflected beam is detected synchronously and phase-sensitively.