Characterization of the outer well of NaH C1Σ+ state by fluorescence depletion spectroscopy

Spectroscopic Study of the B 1Π State of NaH

“…Supporting evidence for our assignment of the rotational quantum number J can also be provided by OODR spectroscopy because this advantageous technique has rigorous state selectivity. The experimental setup for OODR spectroscopy has been described in detail elsewhere. ,,, The V-type OODR was used to confirm our J assignment. Figure illustrates the V-type OODR fluorescence depletion spectra with a common lower-level X (0, 5).…”

“…A comprehensive spectroscopic review of alkali hydride diatomic molecules has been presented . Until now, only a few electronic states have been experimentally observed and reported: X 1 ∑ + , , A 1 ∑ + , , and C 1 ∑ + , states. The NaH B 1 Π state has been studied theoretically for decades, and many of the calculated results indicate that it is a bound state. − However, no experimental observation of this state has been reported to date.…”

Observation of double-well potential of NaH C 1Σ+ state: Deriving the dissociation energy of its ground state

“…6 The outer well potential curve of the NaH double-well C 1 Σ + state has been experimentally characterized using pulsed optical-optical double resonance (OODR) fluorescence depletion spectroscopy. 7 In this study, an extended observation of the higher rovibrational levels (v = 35-42, J = 1-11; the highest observed rovibrational level is about 9 cm 1 to its dissociation limit) of the NaH C 1 Σ + state is presented. These rovibrational levels are used to construct a hybrid double-well potential curve which can reproduce the eigenvalues within the experimental uncertainties.…”

“…The experimental setup is similar to that of the previous arrangement. 7 An Nd-YAG laser (Continuum Powerlite 8000, Santa Clara, USA) with 10 Hz pulse repetition rate, 5-7 ns pulse width, and 50 mJ/pulse was used to pump two wavelength-tunable dye lasers (Lambda Physik Scanmate II, Göttingen, Germany) that have 0.15 cm 1 linewidth and an energy per pulse of 0.3-4.5 mJ. One of the dye lasers, pumped by the third harmonic of the Nd-YAG laser (355 nm), generates a violet PUMP (L1) laser beam to promote the NaH molecules from the X 1 Σ + state to the A 1 Σ + state.…”

“…The OODR spectrum was detected by monitoring the fluorescence depletion of an X-A transition alternative to the PR pair of the pump laser, i.e., the monochromator detects the Figure 2 shows the fluorescence depletion spectra of the vibrational quantum levels near the dissociation limit of the C state. Successive rovibrational levels C (42, 2-10) were recorded via the intermediate levels A (8,(3)(4)(5)(6)(7)(8)(9)(10). There are some fluorescence-enhanced peaks, e.g., on the traces of the intermediate level A (8,9) or A (8,10).…”