Photoassociative formation of ultracold RbCs molecules in the(2)3Πstate

Abstract

We have investigated photoassociative formation of RbCs molecules in the (2) 3 excited state correlated to v = 8, (5)0 + vibrational level in detail. The metastable ground-state RbCs molecules formed by spontaneous decay are ionized by pulsed dye laser through resonance-enhanced two-photon ionization. A rate equation of the photoionization process is introduced to explain the dependence of RbCs + molecular ion intensity on the ionization laser intensity. The saturation effect of molecular ion intensity appears as the photoassociation laser intensity increases. The rotational constant and centrifugal distortion constant are derived to be 0.01304 cm −1 and 0.000015 cm −1 from the photoassociation spectrum with a high sensitivity, respectively. The measured electric dipole moment of the observed (2) 3 state RbCs molecules is 4.7(6) D by Stark effect in static electric field.

Continuous formation of vibronic ground state RbCs molecules via photoassociation

“…Recently a set of short-range PA resonances in RbCs was reported in [18][19][20][21]. The rotational constants correspond to an internuclear separation comparable to that at the bottom of the X 1 + potential well, thus making it possible that these states could have large Franck-Condon factors (FCFs) for decay to the X(v = 0) state.…”

Photoionization spectrum of 85RbCs molecules produced by short range photoassociation

“…2 shows the photoassociation spectrum of the short range molecule state, which was initially assigned to be v ¼ 8, ð5Þ0 þ of ð2Þ 3 Π state [26], but here replaced by ð4Þ0 À with other quantum numbers unchanged based on Ref. [27].…”

“…Most details of the apparatus have been described in our studies of ð2Þ 3 Π excited state 85 RbCs molecules in short range [26]. Here we only describe some key characters and new changes (see Fig.…”

“…Another elegant but much more complex coherent control techniques, two-photon stimulated Raman adiabatic passage (STIRAP) process, recently has been used to produce the rovibrational ground state 87 RbCs molecules starting from Feshbach resonance molecules [22,20]. Especially, short range photoassociated RbCs molecules in ð2Þ 3 Π 0 7 excited state attract many researchers' attention for its simplify and continuous formation scheme to singlet Contents lists available at ScienceDirect journal homepage: www.elsevier.com/locate/jqsrt ground state molecules directly from ultracold atoms [23][24][25][26][27][28], just like the cases of LiCs [29], NaCs [30], KRb [31]. It needs to be declared that ð2Þ 3 Π 0 7 state is a co-written label of ð2Þ 3 Π 0 þ and ð2Þ 3 Π 0 À states.…”

“…It needs to be declared that ð2Þ 3 Π 0 7 state is a co-written label of ð2Þ 3 Π 0 þ and ð2Þ 3 Π 0 À states. In our previous work [26], we investigated photoassociative formation of RbCs molecules in one vibrational state of ð2Þ 3 Π state, and measured the corresponding molecular constant with a high sensitivity, such as rotational constant, distortion constant, and electric dipole moment.…”