Pulse train induced rotational excitation and orientation of a polar molecule

Tyagi, Ashish; Arya, Urvashi; Vidhani, Bhavna; Prasad, Vinod

doi:10.1016/j.saa.2014.03.075

Cited by 12 publications

(8 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…HBr is a polar molecule with moderate permanent dipole moment µ = 0.82876 D and rotational constant B = 8.348296 cm −1 [31,32]. The rotational constant of HBr shows that the rotational period of the molecule is approximately 2.04 ps [34].…”

Section: Resultsmentioning

confidence: 99%

“…We have solved Eq. (14) using fourth-order Runge-Kutta method [30][31][32] with the initial condition taken as molecule being in the ground rotational J = M = 0 state at t = 0 state. This method is quite suitable in obtaining rotational probabilities as their is no dressing by the continuous laser field (which require alternate methods like quasi-energy technique as used by other groups [2][3][4]).…”

Section: Theoretical Approachmentioning

confidence: 99%

See 1 more Smart Citation

Rotational Excitation of Diatomic Molecule: Time Dependent Study

2018

View full text Add to dashboard Cite

Recent experimental evidences have prompted us to study the dynamics of laser-assisted rotational excitation of a diatomic molecule due to an ion impact. The collision time between the ion and the molecule is very small (few atomic units) and the laser pulses considered are of picosecond range. We study the evolution of the rotational probabilities by varying the various laser parameters (pulse shape, field strength, pulse width, frequency) and collision parameters (impact parameter b, collisional velocity v). It is found that the probabilities of the rotational states depend strongly on the laser pulse parameters and the collision parameters. The study is more emphasised by studying J 2 (a parameter defining the extent of the rotational excitation) and Jz for the system under concern. For higher value of b, the maximum value obtained by J 2 increases and vice versa. Also, the molecule enters the transient mode for large b and v.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Theoretical Approachmentioning

confidence: 99%

Rotational Excitation of Diatomic Molecule: Time Dependent Study

2018

View full text Add to dashboard Cite

show abstract

“…Molecules will be aligned in one dimension [219,343], two dimension or in three dimensions [344][345][346][347][348] is decided by type of polarisability and symmetry of the aligning field. Linearly polarised laser fields create 1-D alignments [219,343,350].…”

Section: Adiabatic and Non-adiabatic Alignmentmentioning

confidence: 99%

“…It is quit challenging to orient the molecule than to align them in field free conditions.In order to avoid the destructive effects caused by a weak DC field many schemes like twocolor shaped laser pulse [334] ,two-color phase-locked laser pulse [330][331][332][333], and multi-color laser pulse [335]have been used to achieve the orientation. In literature the molecular orientation has also been achieved by a half-cycle THz laser pulses and few cycle pulses [337,338].…”

Section: Pulse Trainmentioning

confidence: 99%

See 1 more Smart Citation

Orientation and Alignment Dynamics of Polar Molecule Driven by Shaped Laser Pulses

Nautiyal,

Devi,

Tyagi

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

We review on the theoretical status of intense laser orientation and alignment-a field at the interface between intense laser physics and chemical dynamics with the potential applications ranging from high harmonic generation, nano-scale processing and control of chemical reactions. The evolution of the rotational wave packet and its dynamics leading to orientation and alignment is the topic of the present discussion. The major part of the article basically presents an overview on recent theoretical progress in controlling the orientation and alignment dynamics of a molecule by means of shaped laser pulses. The various theoretical approaches that lead to orientation and alignment ranging from static electrostatic field in combination with laser field(s), combination of orienting and aligning field, combination of aligning fields, combination of orienting fields, application of train of pulses etc. are discussed. It is focussed that the train of pulses proves to be quite efficient in increasing the orientation or alignment of a molecule without causing the molecule to ionize. The orientation and alignment both can occur in adiabatic and non-adiabatic conditions with the rotational

show abstract