One-phonon infrared absorption in diamond

Substitutional nitrogen in diamond: A quantum mechanical investigation of the electronic and spectroscopic properties

“…In addition to the characteristic C-centre, such material also contains A-centres (vicinal N s pairs), and, in some cases, X-centres, N + ). 30 Furthermore, additional components, D, E and F centers, 34 G, H and I centers 95 , and recently a Y centre 36,37 have been further identified but not attributed to any specific defect. It is indeed clear that the identification of the unique features of a specific defect, such as the C-centre, in a pure IR spectrum is then not a simple task and requires a prior, or pre-existing, examination of a range of diamond samples by a decomposition procedure involving the subtraction of known spectral features of individual defect centres using one of the well assessed schemes proposed by Davies 96 , Clark and Davey 34,95 and by Woods.…”

“…28,29 On the other hand, synthetic diamonds produced by CVD (carbon vapour deposition) and controlled HTHP (high temperature high pressure) grow generally as type Ib, but often, with minor amounts of other defects. 30 The single substitutional defect, N S , leads to a distinctive IR spectrum with characteristic vibrational modes [31][32][33][34][35][36][37][38] at 1130 and 1344 cm −1 ; it also gives rise to the P1 electron paramagnetic resonance (EPR) signal, which is how it was first discovered in 1959. 39 Both the early EPR and subsequent ENDOR studies [39][40][41][42][43] have shown that the P1 centre has an effective spin of S = 1 2 , a C 3v symmetry with the nitrogen atom, N S , displaced away from one of its four neighbours, and that most of the unpaired spin is located on just one of the carbon atoms neighbouring N S .…”

Aggregate nitrogen in synthetic diamond

“…[11][12][13][14][15][16] Although the question merits further investigation, there is one potential difference in the films produced for this work and, perhaps, the majority of materials which have been studied. [11][12][13][14][15][16] Although the question merits further investigation, there is one potential difference in the films produced for this work and, perhaps, the majority of materials which have been studied.…”

Defects in Cubic Diamonds From the Placers in the Northeastern Siberian Platform: Results of Ir Microspectrometry

“…Интересной особенностью многих природных Ia+Ib алмазов является сложный спектр ИК-поглощения в однофононной области [Collins, Mohammed, 1982;Woods, Collins, 1983;Бокий и др., 1986;Massi, 2006;Hainschwang et al, 2012]. Во многих случаях представление данной спектральной области в виде суперпозиции вкладов А-и С-дефектов не позволяет удовлетворительно описать экспериментальный спектр, что объясняется вкладом других оптических центров, например, E, F [Clark, Davey, 1984] и Y [Hainschwang et al, 2012]. Окраска таких алмазов лишь частично связана с С-дефектами [Hainsсhwang et al, 2013].…”