Nondestructive Identification of Synthetic Quartz Crystal Seals Using Spectroscopy

Abstract

Nondestructive identification of synthetic quartz crystal seals was carried out by Raman and infrared spectroscopies. The micro laser Raman spectroscopy was very useful for identification of quartz crystal because the Raman peaks of quartz were obtained in the range from 100 to 1200 cm^-1. The discrimination between natural and synthetic clear quartz crystals was achieved using the Fourier transform infrared spectroscopy because the hydroxyl stretching vibration bands at 3595 cm^-1 and 3585 cm^-1 were characteristic of synthetic and natural ones, respectively.