The Stark effect in the predissociating Rydberg states of NO

Clarson, B.B.; Procter, Simon R.; Goodgame, A L; Softley, T. P.

doi:10.1080/00268970802298753

Cited by 4 publications

(5 citation statements)

References 53 publications

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“…Because of the high density of states of different rotational and vibrational series close to the adiabatic ionization threshold, the decay dynamics of any individual Rydberg state depends strongly on its energetic position and effects of external fields. 36,37 The detailed characterization of intramolecular interactions between these excited states is therefore essential in preparing samples suitable for deceleration and trapping.…”

Section: Introductionmentioning

confidence: 99%

Excitation and characterization of long-lived hydrogenic Rydberg states of nitric oxide

Deller

Hogan

2020

The Journal of Chemical Physics

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High Rydberg states of nitric oxide (NO) with principal quantum numbers between 40 and 100 and lifetimes in excess of 10 µs have been prepared by resonance enhanced two-color two-photon laser excitation from the X 2 Π 1/2 ground state through the A 2 Σ + intermediate state. Molecules in these long-lived Rydberg states were detected and characterized 126 µs after laser photoexcitation by state-selective pulsed electric field ionization. The laser excitation and electric field ionization data were combined to construct two-dimensional spectral maps. These maps were used to identify the rotational states of the NO + ion core to which the observed series of long-lived hydrogenic Rydberg states converge. The results presented pave the way for Rydberg-Stark deceleration and electrostatic trapping experiments with NO, which are expected to shed further light on the decay dynamics of these long-lived excited states, and are of interest for studies of ion-molecule reactions at low temperatures. arXiv:2005.00090v1 [physics.chem-ph] 30 Apr 2020

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Section: Introductionmentioning

confidence: 99%

Excitation and characterization of long-lived hydrogenic Rydberg states of nitric oxide

Deller

Hogan

2020

The Journal of Chemical Physics

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“…The use of NO photodissociation to produce cold O and N atoms has also been proposed 32 , as has the photodissociation of decelerated SO 2 at threshold to produce cold SO and O 33 . With regard to the other halogens, cold chlorine atoms could be similarly produced by photodissociation of BrCl or Cl 2 and both molecules have highly anisotropic dissociation channels 34,35 , favouring efficient production of cold atoms.…”

Section: Discussionmentioning

confidence: 99%

“…The technique may be extendable to a range of systems, and indeed the application to NO 2 photodissociation to produce NO molecules with a mean velocity of zero has already been proposed 31 and demonstrated. 17,18 The use of NO photodissociation to produce cold O and N atoms has also been proposed, 32 as has the photodissociation of decelerated SO 2 at threshold to produce cold SO and O. 33 With regard to the other halogens, cold chlorine atoms could be similarly produced by photodissociation of BrCl or Cl 2 and both molecules have highly anisotropic dissociation channels, 34,35 favouring efficient production of cold atoms.…”

Section: Discussionmentioning

confidence: 99%

Production of cold bromine atoms at zero mean velocity by photodissociation

Doherty

Bell

Softley

et al. 2011

Phys. Chem. Chem. Phys.

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The production of a translationally cold (T o 1 K) sample of bromine atoms with estimated densities of up to 10 8 cm À3 using photodissociation is presented. A molecular beam of Br 2 seeded in Kr is photodissociated into Br + Br* fragments, and the velocity distribution of the atomic fragments is determined using (2 + 1) REMPI and velocity map ion imaging. By recording images with varying delay times between the dissociation and probe lasers, we investigate the length of time after dissociation for which atoms remain in the laser focus, and determine the velocity spread of those atoms. By careful selection of the photolysis energy, it is found that a fraction of the atoms can be detected for delay times in excess of 100 ms. These are atoms for which the fragment recoil velocity vector is directly opposed and equal in magnitude to the parent beam velocity leading to a resultant lab frame velocity of approximately zero. The FWHM velocity spreads of detected atoms along the beam axis after 100 ms are less than 5 ms À1 , corresponding to temperatures in the milliKelvin range, opening the possibility that this technique could be utilized as a slow Br atom source.

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“…The f(2) series is also clearly visible, but significantly weaker. The dominance of np states in the υ + = 0 spectrum is unsurprising -the strong interaction of the p states with the B 2 and L 2 valence states that lead to predissociation has been well documented [25,29,34,41].…”

Section: Resultsmentioning

confidence: 99%

“…For example, Softley and co-workers studied the effect of external electric fields on low Rydberg states of NO with principal quantum number n < 20 [29,30], and Vrakking and Lee investigated the Stark effect in much higher Rydberg states, where n = 40-120 [31]. In our own group, we have studied the intermediate Rydberg states of NO, with principal quantum number n = 25-35 in static and ramped external fields [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

A spectroscopic investigation of the ionisation and dissociation decay dynamics of Rydberg states of NO

et al. 2014

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Double-resonance spectroscopy has been employed to characterise the autoionising and predissociating Rydberg states of NO converging to the υ + = 0 and υ + = 1 levels of the X 1 + ground state of NO + . Below the lowest ionisation limit, we monitor the formation of the N( 2 D) predissociation product and observe a spectrum dominated by the p(N + = 0) series, with smaller contributions from the p(2) and f(2) series. Many of the lineshapes can be fit to a simple Fano line profile. Upon vibrational excitation, a competing autoionisation channel is opened and we monitor the products of both the dissociation and ionisation channels. The υ + = 1 predissociation spectrum appears much more complex than the υ + = 0 predissociation spectrum, with significant contributions from the p(0), f(2), p(2), s (1) and d(1) series. In contrast, the υ + = 1 ionisation spectrum is dominated by the p(0) and f(2) Rydberg series, with much weaker contributions from s(1), d(1) and p(2) series. The lineshapes in the υ + = 1 predissociation and autoionisation spectra are perturbed and cannot be fit to simple Fano line profiles. In some extreme cases, these perturbations result in the complete disappearance of peaks from either the autoionisation or predissociation spectrum.

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The Stark effect in the predissociating Rydberg states of NO

Cited by 4 publications

References 53 publications

Excitation and characterization of long-lived hydrogenic Rydberg states of nitric oxide

Excitation and characterization of long-lived hydrogenic Rydberg states of nitric oxide

Production of cold bromine atoms at zero mean velocity by photodissociation

A spectroscopic investigation of the ionisation and dissociation decay dynamics of Rydberg states of NO

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