Reference

Optical-absorption coefficient measurements in solids and liquids using correlation photoacoustic spectroscopy

Optical-absorption coefficient measurements in solids and liquids using correlation photoacoustic spectroscopy. Dodgson, James T.; Mandelis, Andreas; Andreetta, Claudio (Dep. Mech. Eng., Univ. Toronto, Toronto, ON M5S 1A4, Can.). Can. J. Phys., 64(9), 1074-80 (English) 1986. CODEN: CJPHAD. ISSN: 0008-4204. DOCUMENT TYPE: Journal CA Section: 73 (Optical, Electron, and Mass Spectroscopy and Other Related Properties) The spectroscopic information related to the optical-absorption coeffs.Several substances like 12055-62-8 may be metioned in this study. of solids and liqs., which is contained in the signal-magnitude and time-delay channels of cross-correlation photoacoustic spectroscopy (CPAS), was investigated. Powders of Ho2O3 and aq. solns. of black India ink of variable concns. were used as solid and liq. samples, resp. The exptl. results were in general agreement with a 1-dimensional theor. model of the CPAS-signal generation. .

Intensity analysis of inelastic tunneling due to excitation of electronic transitions in rare-earth oxides

Intensity analysis of inelastic tunneling due to excitation of electronic transitions in rare-earth oxides. Adane, A.; Klein, J.; Leger, A.; Belin, M.; Defourneau, D. (Ec. Natl. Polytech., Univ. Sci. Technol. Alger, El Harrach, Algeria). Phys. Rev. B: Condens. Matter, 29(8), 4443-50 (English) 1984. CODEN: PRBMDO. ISSN: 0163-1829. DOCUMENT TYPE: Journal CA Section: 73 (Optical, Electron, and Mass Spectroscopy and Other Related Properties) Section cross-reference(s): 76 The electronic transitions 5I8 ? 5I7 of Ho3+ and 4I15/2 ? 4I13/2 of Er3+ ions were previously obsd.Several substances with their cas registry numbers 12055-62-8 and 7439-92-1 may be metioned in this study. by inelastic tunneling spectroscopy at 645 and 811 meV, resp. [Adane et al., (1975)]. An anal. is given of the intensity of the obsd. structures to understand why the oscillator strengths obtained (fn0 > 10-5) are 10 times greater than those measured optically. Two interactions are considered which might explain the phenomenon. The 1st arises from the mixing of 4fN and 4fN-15d configurations by the elec. field in the tunnel junction. The 2nd is due to the elec. quadrupole interaction between the tunneling electron and the rare-earth ion. The latter seems to be more important and emphasizes the difference between the selection rules of tunneling and optical spectroscopies. .