[9] D.L. Bruhwiler, et al. , Phys. Plasmas 10 , 2022 (2003). 

[10] J.K. Lim, et al. , Phys. Rev. ST Accel. Beams 8 , 072401 (2005). 

[11] D. Bauer and P. Mulser, Phys. Rev. A 59 , 569 (1999). 

[12] C. O’Connell, Ph.D. thesis, Stanford University (2005). 

[13] E. Mevel, et al. , Phys. Rev. Lett. 70 , 406 (1993). 

[14] M.V. Ammosov, N.D. Delone, and K.P. Krainov, Sov. Phys. JETP 64 , 1191 (1986). 

[15] R.R. Jones, D. You, P.H. Bucksbaum, Phys. Rev. Lett. 70 , 1236 (1993). 

[16] I. Tudosa, et al. , Nature 428 , 831 (2004). 

[17] A. Tremaine, et al. , Phys. Rev. Lett. 81 , 5816 (1999). 

[18] O.V. Chubar and N.V. Smolyakov, J. Optics (Paris) 24 , 117 (1993). 

[19] G. Andonian, et al. , Phys. Rev. ST Accel. Beams 12 , 030701 (2009). 

[20] i. H. Loos, in Proceedings of the Free Electron Laser Conference (2008), p. THBAU01. 

[21] J. Rosenzweig, et al. , Phys. Rev. Lett. 95 , 195002 (2005). 

