Angular dependence of ionization probability of C2H2 in a linearly polarized intense laser field

2016 ◽  
Vol 662 ◽  
pp. 235-239 ◽  
Author(s):  
Hirokazu Hasegawa ◽  
Yuki Ikeda ◽  
Kotaro Sonoda ◽  
Takahiro Sato ◽  
Atsushi Iwasaki ◽  
...  
Keyword(s):  
Angular Dependence ◽  
Laser Field ◽  
Ionization Probability ◽  
Intense Laser ◽  
Intense Laser Field ◽  
Linearly Polarized

scholarly journals Deformation of an inner valence molecular orbital in ethanol by an intense laser field

2019 ◽  
Vol 5 (5) ◽  
pp. eaaw1885 ◽  
Author(s):  
Hiroshi Akagi ◽  
Tomohito Otobe ◽  
Ryuji Itakura
Keyword(s):  
Laser Field ◽  
Ionization Probability ◽  
Orientation Dependence ◽  
Intense Laser ◽  
Intense Laser Field ◽  
Circularly Polarized ◽  
Ab Initio Simulations ◽  
Photoelectron Angular Distribution ◽  
Valence Molecular Orbital ◽  
Momentum Imaging

Valence molecular orbitals play a crucial role in chemical reactions. Here, we reveal that an intense laser field deforms an inner valence orbital (10a′) in the ethanol molecule. We measure the recoil-frame photoelectron angular distribution (RFPAD), which corresponds to the orientation dependence of the ionization probability of the orbital, using photoelectron-photoion coincidence momentum imaging with a circularly polarized laser pulse. Ab initio simulations show that the orbital deformation depends strongly on the laser field direction and that the measured RFPAD cannot be reproduced without taking the orbital deformation into account. Our findings suggest that the laser-induced orbital deformation occurs before electron emission on a suboptical cycle time scale.

THEORETICAL STUDY OF ABOVE THRESHOLD DISSOCIATION OF HD+ IN FEMTOSECOND LASER FIELDS

2009 ◽  
Vol 08 (06) ◽  
pp. 1197-1215 ◽  
Author(s):  
KAI-JUN YUAN ◽  
ZHENG-TANG LIU ◽  
JIE YU ◽  
MAO-DU CHEN ◽  
SHU-LIN CONG
Keyword(s):  
Kinetic Energy ◽  
Femtosecond Laser ◽  
Laser Field ◽  
Three Dimensional ◽  
Stark Shift ◽  
Molecular Rotation ◽  
Photon Absorption ◽  
Intense Laser ◽  
Intense Laser Field ◽  
Linearly Polarized

The above threshold dissociation (ATD) of the HD+ molecular ion in a linearly polarized femtosecond laser field is theoretically studied using three-dimensional time-dependent quantum wave packet method. Based on the Born–Oppenheimer approximation (BOA), calculations are performed on two electronic states, the ground state 1sσ and the excited state 2pσ. The energy-dependent distributions of the dissociated fragments, resulting from the ATD, are calculated by using an asymptotic-flow expression in the momentum space. The numerical results demonstrate that, in the laser field of wavelength λ = 800 nm and full-width at half-maximum (FWHM) τ = 30 fs , only two-photon dissociation is observable at a weaker pulse peak intensity, 5.0 × 1012 W cm -2, while at an intense intensity, 1.5 × 1015 W cm -2, the dissociated fragments resulting from four-photon absorption dominates over the photodissociation process. These results are consistent with the experimental observation of Orr et al. [Orr PA et al., Phys Rev Lett98:163001, 2007]. The ac Stark-shift caused by intense laser field will change the kinetic energies of the fragments. The ATD phenomena are quantitatively interpreted in terms of the concept of light-induced potential. The molecular rotation and alignment have some effects on the kinetic energy spectrum of the dissociated fragments. The molecular rotation reduces the ac Stark-shift and broadens the peaks of kinetic energy spectra of the dissociated fragments. However, the intense laser field can effectively align the molecule and is helpful to increase the ATD probability. The ATD spectrum is related to the initial quantum numbers J0 and M0 of the molecule. The ATD spectrum of HD+ is calculated at a limited thermal temperature.

HIGH-ORDER HARMONIC GENERATION OF HYDROGEN IN INTENSE LASER FIELD AND STRONG MAGNETIC FIELD

2004 ◽  
Vol 15 (04) ◽  
pp. 493-506
Author(s):  
H. X. QIAO ◽  
Y. C. ZOU ◽  
Z. J. ZHANG
Keyword(s):  
Magnetic Field ◽  
Strong Magnetic Field ◽  
Laser Field ◽  
Pseudospectral Method ◽  
Ionization Probability ◽  
High Order ◽  
Intense Laser ◽  
Intense Laser Field ◽  
High Order Harmonic ◽  
The Magnetic Field

An effective one-dimensional model approach combining time-dependent pseudospectral method and Taylor expansion [Haoxue Qiao et al., Phys. Rev. A65, 063403 (2002)] is generalized to study a real hydrogen atom in an intense laser field. High-order harmonic generations are calculated in several cases of different laser field parameters. The ionization probability is also calculated. The influence of the strong magnetic field on harmonic generations is investigated. It is found that the plateau of high harmonics can be extended by the magnetic field and the cutoff order increases with the increase of the field intensity.

scholarly journals Relativistic stability of positronium atoms in a linearly polarized high frequency super-intense laser field

2021 ◽  
pp. 104348
Author(s):  
Yifan Xing ◽  
Yuanling Huang ◽  
Fengyi Yuan ◽  
Xinye Xu ◽  
Jiaxiang Wang
Keyword(s):  
High Frequency ◽  
Laser Field ◽  
Intense Laser ◽  
Intense Laser Field ◽  
Linearly Polarized

Spin dynamics in nonsequential two-photon double ionization of helium in an intense laser field

2011 ◽  
Vol 83 (4) ◽  
Author(s):  
S. Bhattacharyya ◽  
Mina Mazumder ◽  
J. Chakrabarti ◽  
F. H. M. Faisal
Keyword(s):  
Laser Field ◽  
Spin Dynamics ◽  
Double Ionization ◽  
Intense Laser ◽  
Intense Laser Field ◽  
Two Photon

The effects of the intense laser field on bound states in Ga x In1- x N y As1- y N/GaAs single quantum well

2011 ◽  
Vol 80 (1) ◽  
pp. 89-93 ◽  
Author(s):  
F. Ungan ◽  
E. Kasapoglu ◽  
C. A. Duque ◽  
U. Yesilgul ◽  
S. Şakiroglu ◽  
...  
Keyword(s):  
Quantum Well ◽  
Laser Field ◽  
Bound States ◽  
Intense Laser ◽  
Single Quantum ◽  
Intense Laser Field ◽  
Single Quantum Well
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