Potential curves for the ground and excited states of the Na2 molecule up to the (3<i>s</i>+5<i>p</i>) dissociation limit: Results of two different effective potential calculations

Magnier, S.; Millié, P.; Dulieu, Olivier; Masnou-Seeuws, F.

doi:10.1063/1.464755

Cited by 215 publications

(180 citation statements)

References 50 publications

Supporting

Mentioning

163

Contrasting

Unclassified

Order By: Relevance

“…The laser controlled filtration strategy consists in applying an electromagnetic field with wavelengths around 570nm which couples state u with a repulsive, thus dissociating excited (1) 3 Π g (3 2 S + 3 2 P ) electronic state (referred to as state g). The corresponding Born-Oppenheimer potential energy curves V 1,2 (R) and the electronic transition dipole moment µ 12 (R) between states g and u are taken from the literature [35][36][37] and references therein. Our specific model refers to a rotationless field-aligned molecule in a single spatial dimension (namely, the internuclear distance R).…”

Section: A the Modelmentioning

confidence: 99%

Controlling vibrational cooling with zero-width resonances: An adiabatic Floquet approach

et al. 2016

View full text Add to dashboard Cite

In molecular photodissociation, some specific combinations of laser parameters (wavelength and intensity) lead to unexpected Zero-Width Resonances (ZWR), with in principle infinite lifetimes. Their interest in inducing basic quenching mechanisms have recently been devised in the laser control of vibrational cooling through filtration strategies [O. Atabek et al., Phys. Rev. A87, 031403(R) (2013)]. A full quantum adiabatic control theory based on the adiabatic Floquet Hamiltonian is developed to show how a laser pulse could be envelop-shaped and frequency-chirped so as to protect a given initial vibrational state against dissociation, taking advantage from its continuous transport on the corresponding ZWR, all along the pulse duration. As compared with previous control scenarios actually suffering from non-adiabatic contamination, drastically different and much more efficient filtration goals are achieved. A semiclassical analysis helps in finding and interpreting a complete map of ZWRs in the laser parameter plane. In addition, the choice of a given ZWR path, among the complete series identified by the semiclassical approach, amounts to be crucial for the cooling scheme, targeting a single vibrational state population left at the end of the pulse, while all others have almost completely decayed. The illustrative example, offering the potentiality to be transposed to other diatomics, is Na2 prepared by photoassociation in vibrationally hot but translationally and rotationally cold states.

show abstract

Section: A the Modelmentioning

confidence: 99%

Controlling vibrational cooling with zero-width resonances: An adiabatic Floquet approach

et al. 2016

View full text Add to dashboard Cite

show abstract

“…In order to entail the excitation of a local coherent wave packet with the common available femtosecond laser system, one must choose the target molecule characterized by small vibrational energy. From this point of view, the sodium dimer is an excellent prototype molecule [12,16 -18], also for its detailed information of potential energy curves and that of its single cation [19,20]. Therefore we employed a model of the sodium dimer with three electronic states in this Letter to establish the picture of AT splitting of coherent molecular states: the ground state jXi 1 1 g , the double minimum state jSi (2 1 u ), and the ionic ground state jIi (1 2 g ) [16].…”

mentioning

confidence: 99%

Autler-Townes Splitting in the Multiphoton Resonance Ionization Spectrum of Molecules Produced by Ultrashort Laser Pulses

Lou

2003

Phys. Rev. Lett.

View full text Add to dashboard Cite

We report for the first time the proper conditions to observe Autler-Townes splitting (ac-Stark splitting) from vibrationally coherent states belonging to the different electronic terms of a diatomic molecule. Wave packet dynamics simulations demonstrate that such a process is feasible by multiphoton resonance ionization of the molecule Na 2 with a single ultrashort intense laser pulse. With the ultrahigh time resolution of a femtosecond laser pulse, one can directly measure the absolute value of the transition dipole moment between any kinds of molecular states by this kind of Autler-Townes splitting, which is a function of the internuclear distance R. DOI: 10.1103/PhysRevLett.91.023002 PACS numbers: 33.80.-b, 42.50.-p Atomic Autler-Townes (AT) splitting has been observed on a radio-frequency transition for a long time [1], but AT splitting in a gas-phase molecule has only recently been investigated [2 -6]. Quesada et al. [2] reported the transition dipole moment of H 2 by measuring the ratio of AT splitting to the electric field strength. Qi et al. demonstrated that the transition dipole moment of the lithium dimer could be measured by AT splitting using cw triple resonance spectroscopy [5,6]. AT splitting on the Na atom [7] and a semiconductor [8] with an ultrashort intense pulse have also been explored recently [8]. But, perhaps, because of the relatively small size of the typical molecular transition dipole moment, few papers reported any result about molecular AT splitting on vibrationally coherent states with an ultrashort laser pulse.In this Letter, with multiphoton ionization wave packet dynamics simulations, we demonstrate that one can observe AT splitting in the photoelectron spectrum with a proper single laser pulse and a prototype dimer Na 2 . Because of the direct relation of AT splitting with the local transition dipole moment and the intensity of the electric field, AT splitting can be used to precisely measure, in principle, the peak intensity of the laser pulse if the transition dipole moment is known, which is not easy to accurately determine. On the other hand, one can also measure the internuclear-distance R-dependent local transition dipole moment by AT splitting with a properly localized wave packet if the intensity of the ultrashort laser pulse is known.Along with the development of the ultrashort laser pulse, real-time molecular dynamics has been directly observed and many new phenomena have been investigated [9-13] and will be discovered. In explanation and foreseeing the experimental results, quantum wave packet dynamics simulations play the central role [14 -18]. In order to entail the excitation of a local coherent wave packet with the common available femtosecond laser system, one must choose the target molecule characterized by small vibrational energy. From this point of view, the sodium dimer is an excellent prototype molecule [12,16 -18], also for its detailed information of potential energy curves and that of its single cation [19,20]. Therefore we employed a model of the s...

show abstract

“…The corresponding Born-Oppenheimer potential energy curves V 1,2 (R) and the electronic transition dipole moment µ 12 (R) between states 1 and 2 are taken from the literature [15][16][17].…”

Section: Resultsmentioning

confidence: 99%

Vibrational-ground-state zero-width resonances for laser filtration: An extended semiclassical analysis

2017

View full text Add to dashboard Cite

A semiclassical model supporting the destructive interference interpretation of zero-width resonances (ZWR) is extended to wavelengths inducing c − -type curve crossing situations in Na 2 strong field dissociation. This opens the possibility to get critical couples of wavelengths λ and field intensities I to reach ZWRs associated with the ground vibrationless level v = 0, that, contrary to other vibrational states (v > 0), is not attainable for the commonly referred c + -type crossings.The morphology of such ZWRs in the laser (I, λ) parameter plane and their usefulness in filtration strategies aiming at molecular cooling down to the ground v = 0 state are examined within the frame of an adiabatic transport scheme.

show abstract

Potential curves for the ground and excited states of the Na2 molecule up to the (3s+5p) dissociation limit: Results of two different effective potential calculations

Cited by 215 publications

References 50 publications

Controlling vibrational cooling with zero-width resonances: An adiabatic Floquet approach

Controlling vibrational cooling with zero-width resonances: An adiabatic Floquet approach

Autler-Townes Splitting in the Multiphoton Resonance Ionization Spectrum of Molecules Produced by Ultrashort Laser Pulses

Vibrational-ground-state zero-width resonances for laser filtration: An extended semiclassical analysis

Contact Info

Product

Resources

About