Infrared absorption studies of neutron-irradiated type Ib diamond

✍ Scribed by Y. Mita; Y. Yamada; Y. Nisida; M. Okada; T. Nakashima

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 120 KB
• Volume: 376-377
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2005.12.074

✦ Synopsis

Infrared (IR) absorption measurements were performed at room temperature on neutron-irradiated type Ib diamonds which contain around 100 ppm substitutional nitrogen atoms in single form. It was observed that the 1332 cm À1 absorption peak appears by irradiation but vanishes again at the dose region higher than 2 Â 10 18 n/cm 2 . This phenomenon is explained by using two-step charge compensation model. Furthermore three remarkable peaks are observed at 1530 and 1570 cm À1 and at 1450 cm À1 . Relations between absorption intensity and neutron dose of these peaks were studied. Intensity of these peaks increase linearly with dose; however, the 1450 cm À1 peak intensity saturates around 2 Â 10 17 n/cm 2 in contrast with the others. These results are consistent with the interstitial models proposed previously.