Direct multi-photon ionizations of H2+ in intense laser fields

被引:20
作者
He, Hai-Xiang [1 ,2 ]
Lu, Rui-Feng [3 ]
Zhang, Pei-Yu [1 ]
Han, Ke-Li [1 ]
He, Guo-Zhong [1 ]
机构
[1] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China
[2] Chinese Acad Sci, China & Grad Sch, Beijing 10039, Peoples R China
[3] Nanjing Univ Sci & Technol, Dept Appl Phys, Nanjing 210094, Jiangsu, Peoples R China
关键词
DYNAMICS; DISSOCIATION; MOLECULES; PULSES; BOND;
D O I
10.1088/0953-4075/45/8/085103
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We have discussed a weak ionization channel characterized by the kinetic energy release spectra of the protons from Coulomb explosion with the sum energy over 10 eV from a hydrogen molecular ion for various vibrational states in infrared pulses. After Franck-Condon averaging of the contributions for various vibrational states, a 'shoulder'-like cutoff structure has been obtained which is consistent with the experiment. For longer pulses, a multi-peak structure is obvious for the upsilon = 0 state and attosecond extreme-ultraviolet pulses were adopted to search the essential physical dynamics. The reproductions of the kinetic energy release spectra from extreme-ultraviolet light indicate that the high kinetic energies of the protons must be due to the direct multi-photon ionizations. The origin of the multi-peak structure has also been investigated by the extreme-ultraviolet pulses. Time-dependent spectra reveal the nuclear wavepacket motion and the time region when charge-resonance-enhanced ionization takes place. Competitions between direct multi-photon ionizations and charge-resonance-enhanced ionizations have also been discussed for various intensities and pulse durations for the upsilon = 0 state.
引用
收藏
页数:7
相关论文
共 31 条
[1]   Generalized space translation and new numerical methods for time-dependent Schroedinger equations of molecules in intense laser fields [J].
Bandrauk, AD ;
Lu, HZ .
JOURNAL OF MOLECULAR STRUCTURE-THEOCHEM, 2001, 547 :97-111
[2]   SOFTENING OF THE H2+ MOLECULAR-BOND IN INTENSE LASER FIELDS [J].
BUCKSBAUM, PH ;
ZAVRIYEV, A ;
MULLER, HG ;
SCHUMACHER, DW .
PHYSICAL REVIEW LETTERS, 1990, 64 (16) :1883-1886
[3]   DISSOCIATION, IONIZATION, AND COULOMB EXPLOSION OF H-2(+) IN AN INTENSE LASER FIELD BY NUMERICAL-INTEGRATION OF THE TIME-DEPENDENT SCHRODINGER-EQUATION [J].
CHELKOWSKI, S ;
ZUO, T ;
ATABEK, O ;
BANDRAUK, AD .
PHYSICAL REVIEW A, 1995, 52 (04) :2977-2983
[4]   The time-dependent quantum wave packet approach to the electronically nonadiabatic processes in chemical reactions [J].
Chu, Tian-Shu ;
Zhang, Yan ;
Han, Ke-Li .
INTERNATIONAL REVIEWS IN PHYSICAL CHEMISTRY, 2006, 25 (1-2) :201-235
[5]   Attosecond science [J].
Corkum, P. B. ;
Krausz, Ferenc .
NATURE PHYSICS, 2007, 3 (06) :381-387
[6]   PLASMA PERSPECTIVE ON STRONG-FIELD MULTIPHOTON IONIZATION [J].
CORKUM, PB .
PHYSICAL REVIEW LETTERS, 1993, 71 (13) :1994-1997
[7]   On the computation of momentum distributions within wavepacket propagation calculations [J].
Feuerstein, B ;
Thumm, U .
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 2003, 36 (04) :707-716
[8]   Manipulation of bond hardening in H2+ by chirping of intense femtosecond laser pulses [J].
Frasinski, LJ ;
Posthumus, JH ;
Plumridge, J ;
Codling, K ;
Taday, PF ;
Langley, AJ .
PHYSICAL REVIEW LETTERS, 1999, 83 (18) :3625-3628
[9]   DYNAMICS OF H-2(+) IN INTENSE LASER FIELDS [J].
GIUSTISUZOR, A ;
MIES, FH ;
DIMAURO, LF ;
CHARRON, E ;
YANG, B .
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 1995, 28 (03) :309-339
[10]   Multiphoton ionization of H2+ in xuv laser pulses [J].
Guan, Xiaoxu ;
Secor, Ethan B. ;
Bartschat, Klaus ;
Schneider, Barry I. .
PHYSICAL REVIEW A, 2011, 84 (03)