Vibrational state-selectivity of product HI in photoassociation reaction I + H → HI

Niu, Ying-Yu; Wang, Senming; Cong, Shu‐Lin

doi:10.1016/j.cplett.2006.06.110

Cited by 29 publications

(18 citation statements)

References 32 publications

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“…3, the time duration is roughly 300-500 fs for the cases we considered, and hence, the variation range for the pulse duration is set to be the same. This time interval would be good for association, because if one further increases the pulse duration, the dissociation loss may increase and suppresses the total photoassociation probability [46]. For the pulse intensity, we choose a relatively moderate range for optimization.…”

Section: Resultsmentioning

confidence: 99%

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Isotope effects on the formation of the lowest rovibrational level of NaH molecule via pump–dump photoassociation

et al. 2015

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Section: Resultsmentioning

confidence: 99%

“…The timedependent FC factor in the field-free condition, shown in Fig. 3, gives us a good evaluation of the relatively proper time interval to shine on the pump pulse [46]. As defined in Eq.…”

Section: Resultsmentioning

confidence: 99%

Isotope effects on the formation of the lowest rovibrational level of NaH molecule via pump–dump photoassociation

et al. 2015

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“…However, except for control schemes and the shaping of laser pulses, some initial conditions and accompanying phenomena, such as multiphoton transitions and dissociations, may also greatly affect the PA probability or vibrational‐state selectivity. It is shown that, at lower collision energies, a very high vibrational‐state selectivity of the vibrational state v = 17 can be obtained in the PA process of I + H → HI . Besides, the PA probability of the target state increases from roughly 0.4 to 0.8.…”

Section: Introductionmentioning

confidence: 97%

“…Recently, we found that the molecular alignment occurs in the pump‐dump PA process and can also be used to control the PA process . In addition, for heteronuclear molecular systems with considerable permanent dipole moments, such as He + H + , H + I, and H + O, the PA process is also frequently implemented to directly prepare molecules in the presence of infrared (IR) radiation even at a higher temperature away from the ultracold regime …”

Section: Introductionmentioning

confidence: 99%

Comparative study of the photoassociation reaction of He + X⁺→ HeX⁺ (X = H, D): Including multiphoton transitions and dissociations

Jing¹,

Wang

Zhou³

et al. 2020

Int J of Quantum Chemistry

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Using the time-dependent quantum wave packet method, the photoassociation (PA) processes of He + H + ! HeH + and He + D + ! HeD + , driven by the sin 2 -shaped femtosecond laser pulse in the electronic ground state, including multiphoton transitions and dissociations, are investigated for a wide range of initial collision momenta spanning from 1 to 4 a.u. (or for the collision energy roughly in the ranges of 0.0090.148 eV and 0.0060.089 eV for HeH + and HeD + systems, respectively). It is found that, at some collision momenta, multiphoton transitions to deeply bound states are inevitable to occur and can greatly decrease the PA probability of the target state that selected is the vibrational state v = 6. For the dissociation process, the higher-order (two-and three-photon) dissociations, measured from the target state, tend to be significant at relative high collision energies, which implies that abovethreshold dissociations may also be an important loss mechanism in the PA process.In addition, it is also shown that the higher-order dissociation is much stronger for HeH + systems than that for HeD + systems at a given collision momentum, and could be enhanced by the strong transitions among deeply bound states.above-threshold dissociations, dissociations, multiphoton transitions, photoassociation, time-dependent quantum wave packet method | INTRODUCTIONAs a rapidly developing research field, preparations of cold and ultracold molecules have attracted significant attention in recent years. [1][2][3][4][5][6] These produced molecules, which present strong quantal features, can be used to explore various novel phenomena and dynamic mechanisms, such as the quantum fluid [7] and the topological superfluid phase. [8] Furthermore, these molecules are also important in the measurement of fundamental physical constants, [9][10][11] and in the field of molecular spectroscopy [12] and ultracold chemistry. [13,14] Among myriad routes to prepare ultracold molecules, photoassociation (PA) emerges as an efficient method, which allows us to directly synthesize ultracold molecules, with the interaction of laser field, from an assembly of laser-cooled atoms. [1,2] In a general PA process, a pair of ultracold atoms colliding in the ground electronic state is firstly associated into vibrational levels of the excited electronic state by absorbing one photon. Then, it is followed a stabilization step by either the spontaneous or stimulated emission, which enables us to obtain ultracold groundstate molecules. In the past few years, a burst of PA schemes have been seen, such as chirped pulses, [15,16] asymmetric pulses (or a train of these pulses), [17,18] electric-magnetic fields, [19] pump-dump shames (or a combination of these shames with chirped pulses), [20][21][22] and so on. Recently, we found that the molecular alignment occurs in the pump-dump PA process and can also be used to control the PA process. [23] In addition, for heteronuclear molecular systems with considerable permanent dipole moments, such as He + H + , [24,25] H +...

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“…There are two steps in this PA process: first, the collision atoms induced by a pump pulse form molecules in the excited electronic state, and then those product molecules are transferred to the ground electronic state induced by a dump pulse. A single pulse can also be employed to produce the molecules in the ground electronic state [22,23] . In this process, the pulse induces the collision atoms emitting photons and transferring from continuum states to bound states through permanent dipole moment transition.…”

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Photoassociation reaction of OH molecules through reverse ladder transition

Niu¹,

Wang²

2018

Chin. Opt. Lett.

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Photoassociation via reverse ladder transition controlled by two and four laser pulses is investigated using the time-dependent quantum wave packet method. The calculated results show that the amplitudes of the pulses have an enormous effect on the target population and total yield of association. For the target state with a high energy level, the population of background states can reduce the state-selectivity. Although, the total yield of association is decreased, the four pulses can induce the population transferring to low vibrational levels, and the state-selectivity of the target state is high.

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Vibrational state-selectivity of product HI in photoassociation reaction I + H → HI

Cited by 29 publications

References 32 publications

Isotope effects on the formation of the lowest rovibrational level of NaH molecule via pump–dump photoassociation

Isotope effects on the formation of the lowest rovibrational level of NaH molecule via pump–dump photoassociation

Comparative study of the photoassociation reaction of He + X⁺→ HeX⁺ (X = H, D): Including multiphoton transitions and dissociations

Photoassociation reaction of OH molecules through reverse ladder transition

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Vibrational state-selectivity of product HI in photoassociation reaction I + H → HI

Cited by 29 publications

References 32 publications

Isotope effects on the formation of the lowest rovibrational level of NaH molecule via pump–dump photoassociation

Isotope effects on the formation of the lowest rovibrational level of NaH molecule via pump–dump photoassociation

Comparative study of the photoassociation reaction of He + X+→ HeX+ (X = H, D): Including multiphoton transitions and dissociations

Photoassociation reaction of OH molecules through reverse ladder transition

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Comparative study of the photoassociation reaction of He + X⁺→ HeX⁺ (X = H, D): Including multiphoton transitions and dissociations