not received MitochondriaLaser Transmembrane proton gradient Membrane potential A TP synthesis Oxygen uptake

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Recently experimental evidence have been obtained, by optical absorption meas-urement~ with polarized light (4 1C) that GaSe has an indirect energy gap (1, 2),

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The energies of IR active Azu modes in both HBe, and HfS, are not known, since it is experimentally difficult to perform IR spectroscopy measurements for Eilc. The experimental results of our first and second order resonance Raman measurements show that A,,(TO) = 180cm-' and A,,(LO) = 295cm-' in HfS,; in HfSe, we obtain A,,(TO) = 120cm-' and A2,(LO) = 175cm-' . Our results are consistent with those theoretically calculated by means of the polarizable ion model.* Work partially supported by M.P.I.