scholarly journals Extracting the Ionization Rate From Photoelectron Momentum Distribution Induced by Circularly Polarized Laser Pulse

10.29007/62hv ◽  
2020 ◽  
Author(s):  
Nguyen Thanh Vinh Pham ◽  
Oleg I. Tolstikhin ◽  
Toru Morishita
Keyword(s):  
Laser Pulse ◽  
Momentum Distribution ◽  
Laser Field ◽  
Molecular Hydrogen ◽  
Molecular System ◽  
Ionization Rate ◽  
Transverse Plane ◽  
Hydrogen Ion ◽  
Circularly Polarized ◽  
Adiabatic Theory

In this paper, the adiabatic theory is implemented to consider the ionization process of molecular system exposed to circularly polarized laser pulse. The photoelectron momentum distribution exhibits strong evidence of the properties of the molecular orbital. We also present the possibility to retrieve the ionization rate of the ionized electron from photoelectron momentum distribution in the transverse plane respecting to the polarized plane of the laser field. These results are vital in the viewpoint of the experiment. Several states of molecular hydrogen ion are considered for illustration.

Multi-Photon Ionization by a Two-Color Laser Pulse

2010 ◽  
Vol 5 (4) ◽  
pp. 108-112
Author(s):  
Igor A. Kotelnikov ◽  
Aleksandr P. Shkurinov
Keyword(s):  
Phase Shift ◽  
Laser Pulse ◽  
Femtosecond Laser ◽  
Laser Field ◽  
Second Harmonic ◽  
Ionization Rate ◽  
Asymptotic Formulas ◽  
Imaginary Time ◽  
Average Momentum ◽  
Photon Ionization

A method of imaginary time [1] is used to calculate the probability of multi-photon ionization of atoms by a femtosecond laser field with an admixture of the second harmonic. The conditions for the second harmonic to dominate over the first harmonic in the course of ionization of atoms are found. It is shown that the average momentum of the photoelectrons ejected from an atom depends on the phase shift between the first and second harmonics, as well as on their mutual polarization. Asymptotic formulas for the ionization rate and the average momentum of photoelectrons are obtained. They generally confirm predictions of a phenomenological model based on the classical views [2]

scholarly journals High sensitive label-free optical sensor based on Goos–Hänchen effect by the single chirped laser pulse

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Elnaz Rezaei Benam ◽  
Mostafa Sahrai ◽  
Jafar Poursamad Bonab
Keyword(s):  
Laser Pulse ◽  
Ground State ◽  
Laser Field ◽  
Molecular System ◽  
Biological Molecules ◽  
Label Free ◽  
Number Density ◽  
Vibrational Levels ◽  
Cavity Configuration ◽  
Chirped Laser Pulse

Abstract We consider a four-level molecular system with two ground-state vibrational levels and two excited-state vibrational levels inside a constant cavity configuration. We discuss the reflected and transmitted Goos–Hänchen (GH) shifts of a positive and negative single-chirped laser pulse. The impacts of the laser field detuning, intensity of applied laser field, and appropriately tuning the chirp rate on GH shifts are then analyzed. It is also found that this sensor is very sensitive to the refractive index of the intracavity medium, which can coherently be controlled by the medium parameters. The results show that such a sensor can be most effective for detecting biological molecules with low concentration than the large number density, where a bit variation in the concentration of sample will lead to a great variation on the GH shifts.

scholarly journals Generation of Energetic Highly Elliptical Extreme Ultraviolet Radiation

Photonics ◽  
2021 ◽  
Vol 8 (9) ◽  
pp. 378
Author(s):  
Emmanouil Vassakis ◽  
Ioannis Orfanos ◽  
Ioannis Liontos ◽  
Emmanouil Skantzakis
Keyword(s):  
Laser Pulse ◽  
Gas Phase ◽  
Harmonic Generation ◽  
Spectral Region ◽  
Laser Field ◽  
Extreme Ultraviolet ◽  
High Harmonic ◽  
Circularly Polarized ◽  
Atomic Medium ◽  
Extreme Ultraviolet Radiation

In this study, the generation of energetic coherent extreme ultraviolet (XUV) radiation with the potential for controlled polarization is reported. The XUV radiation results from the process of high harmonic generation (HHG) in a gas phase atomic medium, driven by an intense two-color circularly polarized counter-rotating laser field, under loose focusing geometry conditions. The energy of the XUV radiation emitted per laser pulse is found to be of the order of ~100 nJ with the spectrum spanning from 17 to 26 eV. The demonstrated energy values (along with tight XUV focusing geometries) are sufficient to induce nonlinear processes. Our results challenge current perspectives regarding ultrafast investigations of chiral phenomena in the XUV spectral region.

Imaging of strong field dissociative single and double ionization channels of N2O

2017 ◽  
Vol 31 (29) ◽  
pp. 1750215 ◽  
Author(s):  
Feras Afaneh ◽  
Horst Schmidt-Böcking
Keyword(s):  
Angular Distribution ◽  
Laser Pulse ◽  
Momentum Distribution ◽  
Strong Field ◽  
Double Ionization ◽  
Photoelectron Angular Distribution ◽  
Ionization Processes ◽  
Elliptically Polarized ◽  
Molecular Frame ◽  
Ionization Rates

In this paper, we study single and double ionizations of N2O in a short elliptically polarized 800 nm laser pulse using the COLTRIMS technique. The molecular-frame photoelectron angular distribution and the ion sum-momentum distribution of single and double ionizations of N2O molecules are reported for the single ionization dissociative channel NO[Formula: see text] + N and the double ionization dissociative channel NO[Formula: see text] + N[Formula: see text]. The ionizations of multiple orbitals for the two studied dissociative channels were identified via studying the orientation dependent ionization rates for their KERs. The results show that the shape of the ionizing orbitals governs the single and double ionization processes of N2O.

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