[1] Walker J 1979 Rep. Prog. Phys. 42 1605
[2] Crookes K 1904 P. Roy. Soc. A 74 47
[3] Steeds J W, Davis T J, Charles S J 1999 Diamond Relat. Mater. 8 1847
[4] Wang K, Steeds J, Li Z 2012 Diamond Relat. Mater. 25 29
[5] Steeds J W, Sullivan W, Wotherspoon A 2009 J. Phys.: Condens. Matter 21 364219
[6] Steeds J, Wang K, Li Z 2012 Diamond Relat. Mater. 23 154
[7] Steeds J W, Charles S J, Davis T J 2000 Diamond Relat. Mater. 9 397
[8] Collins A T, Wood G S 1987 J. Phys. C: Solid State Phys. 20 L797
[9] Collins A T, Rafique S 1979 Proc. R. Soc. Lond. A 367 81
[10] Collins A T, Dahwich A 2004 Diamond Relat. Mater. 13 1959
[11] Wang K, Steeds J, Li Z 2012 Diamond Relat. Mater. 25 162
[12] Charles S J, Steeds J W, Evans D J F 2002 Diamond Relat. Mater. 11 681
[13] Charles S J, Steeds J W, Evans D J F 2003 J. Appl. Phys. 94 3091
[14] Mainwood A, Stoneham A M 1997 J. Phys.: Condens. Matter 9 2453
[15] Yelisseyev A, Babich Y, Nadolinny V 2002 Diamond Relat. Mater. 2 130