Binggeli and Chelikowsky reply

Abstract
This is a response to a comment (Phys. Rev. Lett. 71, 2674 (1993)) on the authors’ previous work titled Elastic Instability in Alpha- Quartz under Pressure (Phys. Rev. Lett. 69, 2220 (1992)). The initiation mechanism for amorphous transition in alpha-quartz under pressure being a soft optic phonon in the Brillouin zone boundary as suggested by the comment does not contradict the authors’ early suggestion which is the transverse acoustic mode near the zone center. (AIP)

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