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Controlling vibrational population distribution of the Na2 molecule by ultrashort pulses in the three-state system

Jian Yang, Shuo Wang, Wei-Shen Zhan +2 more

The European Physical Journal DJul 1, 20171 citation

Controlling Population Transfer and Dissociation Rate of Na 2 Molecules with Ultra-Short Intense Laser Pulses

Kai‐Jun Yuan, Senming Wang, Shu‐Lin Cong

A scheme used for controlling the population transfer and the dissociation rate of Na 2 molecules is described by using the quantum wavepacket dynamical method. It is theoretically shown that the population transfer and the dissociation rate of Na 2 molecules can be controlled by pump and probe laser pulses with appropriate widths of pulses, sequence and intensities.

Chinese Physics LettersSep 22, 20058 citations

Complete population transfer to and from a continuum and the radiative association of cold Na atoms to produce translationally cold Na2 molecules in specific vib-rotational states

Amichay Vardi, M. Shapiro, Klaas Bergmann

We demonstrate the feasibility of a laser induced complete population transfer to and from a continuum of states. We study the two-photon dissociation of v = 28; J = 1,...,10 sodium dimers. We demonstrate that using just a pair of "counter intuitively" ordered pulses we can dissociate 100% of the molecules in an ensemble. The scheme is shown to be stable with respect to the initial choice of rotational level and to fluctuations in the laser frequency and intensity. We also study the reverse phenomenon of complete population transfer from the continuum. We perform calculations on the radiative association of Na atoms to form the Na2 molecule in specific vib-rotational states. It is shown that two pulses of 20 nsec duration and as little as 6 MW/cm 2 peak power can photo-associate more than 98% of the atoms within a (pulse and velocity determined) relative effective distance, to yield Na2 molecules in the chosen v = 28; J = 10 vib-rotational state. This means that given a density of 10 16 atoms/cm 3 and a temperature of 7K, a 10Hz pulsed laser source of the above parameters can con- vert half of all the Na atoms in the ensemble to v = 28; J = 10 Na2 molecules within 15 seconds of operation.We demonstrate the feasibility of a laser induced complete population transfer to and from a continuum of states. We study the two-photon dissociation of v = 28; J = 1,...,10 sodium dimers. We demonstrate that using just a pair of "counter intuitively" ordered pulses we can dissociate 100% of the molecules in an ensemble. The scheme is shown to be stable with respect to the initial choice of rotational level and to fluctuations in the laser frequency and intensity. We also study the reverse phenomenon of complete population transfer from the continuum. We perform calculations on the radiative association of Na atoms to form the Na2 molecule in specific vib-rotational states. It is shown that two pulses of 20 nsec duration and as little as 6 MW/cm 2 peak power can photo-associate more than 98% of the atoms within a (pulse and velocity determined) relative effective distance, to yield Na2 molecules in the chosen v = 28; J = 10 vib-rotational state. This means that given a density of 10 16 atoms/cm 3 and a temperature of 7K, a 10Hz pulsed laser source of the above parameters can con- vert half of all the Na atoms in the ensemble to v = 28; J = 10 Na2 molecules within 15 seconds of operation.

Optics ExpressJan 18, 199933 citations

Collision induced dissociation of Na2: dependence of the dissociation rate on the vibrational distribution

R. Huber, H.G. Weber

Chemical PhysicsDec 1, 19789 citations

Excitation of sodium atoms by 330-nm laser pulses

T. Stacewicz, N. A. Gorbunov, P. Kozłowski

Applied Physics BApr 1, 199818 citations

Steering population transfer of the Na 2 molecule by an ultrashort pulse train

Dong-Hua Niu, Shuo Wang, Wei-Shen Zhan +2 more

Abstract We theoretically investigate the complete population transfer among quantum states of the N a 2 molecule using ultrashort pulse trains using the time-dependent wave packet method. The population accumulation of the target state can be steered by controlling the laser parameters, such as the variable pulse pairs, the different pulse widths, the time delays and the repetition period between two contiguous pulses; in particular, the pulse pairs and the pulse widths have a great effect on the population transfer. The calculations show that the ultrashort pulse train is a feasible solution, which can steer the population transfer from the initial state to the target state efficiently with lower peak intensities.Abstract We theoretically investigate the complete population transfer among quantum states of the N a 2 molecule using ultrashort pulse trains using the time-dependent wave packet method. The population accumulation of the target state can be steered by controlling the laser parameters, such as the variable pulse pairs, the different pulse widths, the time delays and the repetition period between two contiguous pulses; in particular, the pulse pairs and the pulse widths have a great effect on the population transfer. The calculations show that the ultrashort pulse train is a feasible solution, which can steer the population transfer from the initial state to the target state efficiently with lower peak intensities.

Laser PhysicsMar 21, 20181 citation

Controlling Population Transfer and Dissociation Rate of Na2 Molecules with Ultra-Short Intense Laser Pulses

Abstract

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Controlling Population Transfer and Dissociation Rate of Na2 Molecules with Ultra-Short Intense Laser Pulses

Abstract

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