[1] Dischler B and Wild C 1998 Low-Pressure Synthetic Diamond:
Manufacturing and Applications (Berlin: Springer) p 331

[2] Jin S and Moustakas T D 1994 Appl. Phys. Lett. 65 403

[3] Yang J X, Zhang H D, Li C M, Chen G C, Lu F X, Tang W Z and Tong Y
M 2004 Diamond Relat. Mater. 13139

[4] Smith W V, Sorokin P P, Gelles I L and Lasher G J 1959 Phys.
Rev. 115 1546

[5] Kurtsiefer C, Mayer S, Zarda P and Weinfurter H 2000 Phys.
Rev. Lett. 85 290

[6] Childress L, Taylor J M, Sorensen A S and Lukin M D 2005 Phys.
Rev. A 72 052330

[7] Greentree A D, Devitt S J and Hollenberg L C L 2006 J. Phys.:
Condens. Matt. 18 S825

[8] Cherpak N T 1996 Distributed-Type Quantum Amplifiers
$($Masers$)$ in the Microwave Waveband (Kiev: Naukova Dumka) (in Russian)

[9] Loubser J H N and van Wyk J A 1978 Rep. Prog. Phys.
41 1201

[10] Lapchuk N M, Poklonski N A, Vyrko S A, Ralchenko V G, Zavedeev E
V, Khmelnitskii R A and Khomich A V 2003 Hydrogen Materials
Science and Chemistry of Metal Hydrides ed Veziroglu N et al
(Dordrecht: Kluwer Academic) p 792

[11] Poklonski N A, Lapchuk N M and Lapchuk T M JETP Lett. 2004
80 748

[12] Poklonski N A 2006 Techn. Phys. Lett. 32 309

[13] Twitchen D J, Baker J M, Newton M E and Johnston K 2000 Phys.
Rev. B 61 9

[14] Yelisseyev A, Lawson S, Sildos I, Osvet A, Nadolinny V, Feigelson
B, Baker J M, Newton M and Yuryeva O 2003 Diamond Relat. Mater.
12 2147

[15] Lu F X, Zhong G F, Sun L G, Fu Y L and Tang W Z 1998 Diamond
Relat. Mater. 7 737

[16] Ralchenko V, Sychov I, Vlasov I, Konov V, Khomich A and Voronina S
1999 Diamond Relat. Mater. 8 189

[17] Robins L H, Cook L P, Farabaugh E N and Feldman A 1989 Phys.
Rev. B 39 13367

[18] Ruan J, Choyke W J and Partlow W D 1991 J. Appl. Phys.
69 6632

[19] Collins A T and Lawson S C 1989 J. Phys. D: Condens. Matter.
1 6929

[20] Kanda H, Watanabe K, Eun K Y and Lee J K 2003 Diamond Relat.
Mater. 12 1760

[21] Couderc P and Catherine Y 1987 Thin Solid Films 14 93

[22] Nistor S V, Stefan M, Ralchenko V, Khomich A and Schoemaker D 2000
J. Appl. Phys. 87 8741

[23] Talbot-Ponsonby D F, Newton M E, Baker J M, Scarsbrook G A,
Sussmann R S, Whitehead A J and Pfenninger S 1998 Phys. Rev. B
57 2264

[24] Isoya J, Kanda H, Sakaguchi I, Morita Y and Ohshima T 1997
Radiat. Phys. Chem. 50 321

[25] Poklonski N A, Kislyakov E F, Bubel' O N and Vyrko S A 2006
Proceed. Conf. Carbon Nanostructures (Minsk 20--23 June 2006) p 260

[26] Zel'dovich Y B 1974 Sov. Phys. JETP Lett. 19 74

[27] Tucker E B 1961 Phys. Rev. Lett. 6 547