Isotope Shift for the Low Energy (63cm&lt;sup&gt;-1&lt;/sup&gt;) Excitation of the Al-H Complex in Si: Evidence for a Hydrogen Wagging Mode

Stavola, Michael; Cheng, Yuan; Davies, Gordon

doi:10.4028/www.scientific.net/msf.143-147.885

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“…31 The behavior of the Al-H complex under stress is also more complicated than for B-H and provides additional information about the complex and its low-frequency mode. 12,13 The shift rates of the 2201-cm Ϫ1 line are nonlinear in the stress and another line, ϳ25 cm Ϫ1 to higher frequency, is induced by stress. In this paper we present a thorough investigation of these effects for both Al-H and Al-D complexes.…”

Section: Introductionmentioning

confidence: 99%

Al-H and Al-D complexes in Si: A uniaxial-stress study of the hydrogen vibrational modes

Stavola

Davies

1996

Phys. Rev. B

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Perturbation of the 2201-cm Ϫ1 absorption line of the Al-H complex in Si by uniaxial stress is shown to be consistent with a stretching mode of a center with an effectively trigonal symmetry. Quantitative analyses of the effects of the stresses and of varying the temperature reveal the presence of a very-low-frequency transverse mode which transforms as the E irreducible representation in the trigonal symmetry. Its frequency is 64 cm Ϫ1 in the ground state of the stretching mode ͑representation A 1 ͒. An A 1 ϩE combination mode, observed only under stress, lies 24 cm Ϫ1 above the excited state of the A 1 mode. Upon substituting D for H, the frequencies of the stretching and transverse modes are reduced by approximately a factor of 1/&, as expected for vibrations which predominantly involve the H ͑D͒ atom. The symmetries of the center and of its modes are unchanged by the isotopic substitution. The Al-H axis may be preferentially aligned along one of the ͗111͘ axes by an applied stress. The barrier to reorientation is ϳ370 meV. ͓S0163-1829͑96͒03139-6͔

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Section: Introductionmentioning

confidence: 99%