scholarly journals Theoretical study of the electron correlation and excitation effects on energy distribution in photon impact ionization

2019 ◽  
Vol 65 (3) ◽  
pp. 224
Author(s):  
V. Petrovic ◽  
K. Isakovic ◽  
And H. Delibasic
Keyword(s):  
Energy Distribution ◽  
Electron Correlation ◽  
Laser Field ◽  
Transition Rate ◽  
Theoretical Study ◽  
Impact Ionization ◽  
Ionization Mechanism ◽  
Tunneling Ionization ◽  
Analytical Formulas ◽  
Electrical Component

We performed a detailed theoretical study of the electron correlation and core excitation effects on the energy distribution of the ejected electrons in the process of photon impact tunnel ionization. We used the Landau-Dykhne approach to obtain analytical formulas for the transition rate and the energy distribution with included these effects. We have limited ourselves to a non-relativistic domain, in which the rate and distribution are determined by electrical component of the laser field while the influence of magnetic can be neglected. We observed helium and helium like atoms. We have shown that the tunneling ionization mechanism may be understood as the combination of mentioned processes. We considered the case of a monochromatic wave with an elliptically polarized laser field. We compared our results with experimental and shown that ellipticity plays an important role and that inclusion of additional processes significantly influences the transition rate, as well as the energy distribution of the ejected photoelectrons.

THEORETICAL STUDY OF UNIPOLAR INTERSUBBAND IMPACT IONIZATION IN QUANTUM DOT BASED PHOTODETECTORS

2013 ◽  
Vol 27 (29) ◽  
pp. 1350208 ◽  
Author(s):  
AMIR YUSEFLI ◽  
MAHDI ZAVVARI ◽  
KAMBIZ ABEDI
Keyword(s):  
Quantum Dot ◽  
Transition Rate ◽  
Theoretical Study ◽  
Impact Ionization ◽  
Photogenerated Electron ◽  
Ionization Rate ◽  
Rate Equations ◽  
Infrared Photodetector ◽  
Avalanche Gain ◽  
Carrier Scattering

In this paper, we study the intersubband impact ionization through conduction band states of quantum dot (QD) layers of an infrared photodetector. For this purpose, a photogenerated electron moving in high field active region of a p-i-n diode is assumed which can excite an electron from ground state of a QD by carrier–carrier scattering. The generated electron can escape the QD by tunneling and contribute in photocurrent giving avalanche gain to photodetector. The ionization rate and responsivity of detector are calculated from an analytical approach of intersubband transition rate equations. Results show increased responsivity in the order of several A/W.

A theoretical study of vibrational effects on strong field ionization of CS2

2018 ◽  
Vol 17 (08) ◽  
pp. 1850052
Author(s):  
Meixia Zhang ◽  
Guangwen Xu ◽  
Guoying Lu ◽  
Peng Song
Keyword(s):  
Theoretical Study ◽  
Strong Field ◽  
Orientation Angle ◽  
Field Ionization ◽  
Vibrationally Excited ◽  
Tunneling Ionization ◽  
Strong Field Ionization ◽  
Vibration Effect ◽  
Primary Contribution ◽  
Ionization Rates

Tunneling ionization of vibrationally excited CS2 molecules in their ground electronic state is calculated using molecular orbital Ammosov–Delone–Krainov theory (MO-ADK) considering bond length-dependence and bond angle-dependence. The tunneling ionization rates and the corresponding electron density are calculated respectively for different initial states. A relationship between laser intensity and the molecular orientation angle is determined and compared with experimental results, showing excellent agreement. Our calculations show that the primary contribution of vibration effect to CS2 in tunneling ionization is due to the symmetric expansion mode.

Behaviour of tunnelling transition rate of argon atom exposed to strong low-frequency elliptical laser field

Pramana ◽  
2015 ◽  
Vol 86 (3) ◽  
pp. 565-573 ◽  
Author(s):  
TATJANA B MILADINOVIĆ ◽  
VIOLETA M PETROVIĆ
Keyword(s):  
Laser Field ◽  
Transition Rate ◽  
Argon Atom ◽  
Low Frequency

k dependence of the impact ionization transition rate in bulk InAs, GaAs, and Ge

1992 ◽  
Vol 71 (6) ◽  
pp. 2736-2740 ◽  
Author(s):  
Yang Wang ◽  
Kevin F. Brennan
Keyword(s):  
Transition Rate ◽  
Impact Ionization ◽  
The Impact

THEORY OF BARRIER-SUPPRESSION IONIZATION OF ATOMS

1995 ◽  
Vol 04 (04) ◽  
pp. 775-798 ◽  
Author(s):  
V. P. KRAINOV
Keyword(s):  
Laser Field ◽  
Multiphoton Ionization ◽  
Low Frequency ◽  
Ionization Probability ◽  
Theoretical Description ◽  
Tunneling Ionization ◽  
Theoretical Approaches ◽  
Frequency Laser ◽  
Energy And Angular Distributions ◽  
Analytical Expressions

The theoretical description of the ionization of an atom (ion) by external electromagnetic radiation up to now concerned two alternative situations; multiphoton ionization and tunneling ionization. For both cases the formulas describing the ionization probability when the intensity of the laser field is not too strong are well known. However, if the field is strong, then there exists a new channel; the so-called barrier-suppression (or above-barrier) ionization of the atom. How does this process occur? It is obvious that barrier-suppression ionization and sub-barrier tunneling ionization by low-frequency laser field transform smoothly into one another as the field strength F is varied near the value of the barrier-suppression field F BSI . This paper contains a review of various theoretical approaches developed during the last few years, especially analytical considerations. Some new semi-analytical expressions for ionization rates, energy and angular distributions of ejected electrons are also derived.

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