We present harmonic spectra from hydrogen molecular ions with different ionization energy Ip. By comparing the recombination matrix element from helium ions and hydrogen molecular ions, we verify that the interference effect in high-order harmonic generation originates from the recombination interference. A numerical study on recombination matrix elements in 1D shows that ω=Ek+Ip holds only when an exact continuum wavefunction is used, and the positions of extrema in harmonic spectra can be predicted accurately. We demonstrate that the positions of extrema in harmonic spectra are mainly affected by bounding potential dependence of the recombination interference.
We present harmonic spectra from hydrogen molecular ions with different ionization energy Ip. By comparing the recombination matrix element from helium ions and hydrogen molecular ions, we verify that the interference effect in high-order harmonic generation originates from the recombination interference. A numerical study on recombination matrix elements in 1D shows that ω=Ek+Ip holds only when an exact continuum wavefunction is used, and the positions of extrema in harmonic spectra can be predicted accurately. We demonstrate that the positions of extrema in harmonic spectra are mainly affected by bounding potential dependence of the recombination interference.
[1] Protopapas M, Keitel C H and Knight P L 1997 Rep. Prog. Phys. 60 389 [2] Brabec T and Krausz F 2000 Rev. Mod. Phys. 72 545 [3] Krausz F 2009 Rev. Mod. Phys. 81 163 [4] L'Huillier A, Schafer K J and Kulander K C 1991 J. Phys. B 24 3315 [5] Zuo T, Chelkowski S and Bandrauk A D 1993 Phys. Rev. A 48 3837 [6] Aubanel E E, Zuo T and Bandrauk A D 1994 Phys. Rev. A 49 3776 [7] Zimmermann B, Lein M and Rost J M 2005 Phys. Rev. A 71 033401 [8] Corkum P B 1993 Phys. Rev. Lett. 71 1994 [9] Lein M, Hay N, Velotta R, Marangos J P and Knight P L 2002 Phys. Rev. A 66 023805 [10] Kanai T, Minemoto N and Sakai H 2005 Nature 435 470 [11] Vozzi C et al 2005 Phys. Rev. Lett. 95 153902 [12] Kamta G L and Bandrauk A D 2005 Phys. Rev. A 71 053407 [13] Lein M, Hay N, Velotta R, Marangos J P and Knight P L 2002 Phys. Rev. Lett. 88 183903 [14] Zhou X X and Zhao Z X 2005 Phys. Rev. A 71 061801(R) [15] Zhao J and Zhao Z X 2008 Phys. Rev. A 78 053414 [16] Hay N, Velotta R, Lein M, Nalda R de, Heesel E, Castillejo M and Marangos J P 2002 Phys. Rev. A 65 053805 [17] Lein M, Corso P P, Marangos J P and Knight P L 2003 Phys. Rev. A 67 023819 [18] Zhou X X, Tong X M, Zhao Z X and Lin C D 2005 Phys. Rev. A 72 033412 [19] Itatani J, Levesque J, Zeidler D, Niikura H, Pepin H, Kieffer J C, Corkum P B and Villeneuve D M 2002 Nature 432 867 [20] Yudin G L, Chelkowski S and Bandrauk A D 2006 J. Phys. B 39 L17 [21] Ciappina M F, Chirilä C C and Lein M 2007 Phys. Rev. A 75 043405 [22] Patchkovskii S, Zhao Z X, Brabec T and Villeneuve D M 2006 Phys. Rev. Lett. 97 123003 [23] Chuluunbaatar O, Joulakian B B, Tsookhuu K and Vinitsky S I 2004 J. Phys. B 37 2607 [24] Saugout S, Cornaggia C, Weiner A S and Charron E 2007 Phys. Rev. Lett. 98 253003 [25] Feit M D, Fleck J A and Steiger J 1982 Comput. Phys. 47 412 [26] Zhao Z X, Yuan J M and Brabec T 2007 Phys. Rev. A 76 031404(R)
2010, Vol. 27 
