1. E.g., reviews by H. Lüth: Appl. Phys.8, 1 (1975)
2. G. Heiland, W. Mönch: Surf. Sci.37, 30 (1973)
3. G. Chiarotti: Recent Developments in Condensed Matter Physics1, 633 (Plenum Press, New York 1981) and references therein
4. A. Hordvick: Appl. Opt.16, 2827 (1977)
5. Other photothermal techniques include photoacoustic spectroscopy [see, for example:Optoacoustic Spectroscopy and Derection, ed. by Y.-H. Pao (Academic Press, New York 1977); W.B. Jackson, N.M. Amer: J. Appl. Phys.51, 3343 (1980)]; photothermal deflection spectroscopy [W.B. Jackson, N.M. Amer, A.C. Boccara, D. Fournier: Appl. Opt.20, 1333 (1981)]; and photothermal radiometry [S.O. Kanstad, P.-E. Nordal: Appl. Surf. Sci.6, 372 (1980)]; among others. However, none of those techniques meet all the requirements for experiments which require ultrahigh vacuum, high spatial resolution, cryogenics or the high temperatures necessary for annealing many materials