Photoionization and photodissociation of nitric oxide in the range 9–35 eV

Erman, P.; Karawajczyk, A.; Rachlew-Källne, E.; Strömholm, C.

doi:10.1063/1.468616

Cited by 49 publications

(52 citation statements)

References 39 publications

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“…As noted above, it seems unlikely that spontaneous predissociation can keep pace with the rate at which collisions with electrons redistribute the energy of Rydberg molecules. However, with 8 eV of internal energy NO * presents a dense manifold of underlying valence states [25]. Strong perturbations arising in electron-molecule collisions could go far to relax configurational barriers to Rydberg-valance coupling and consequent intramolecular relaxation [26].…”

Section: Electron Impactmentioning

confidence: 99%

On the formation and decay of a molecular ultracold plasma

Saquet

Morrison

Schulz-Weiling

et al. 2011

J. Phys. B: At. Mol. Opt. Phys.

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Abstract.Double-resonant photoexcitation of nitric oxide in a molecular beam creates a dense ensemble of 50f (2) Rydberg states, which evolves to form a plasma of free electrons trapped in the potential well of an NO + spacecharge. The plasma travels at the velocity of the molecular beam, and, on passing through a grounded grid, yields an electron time-of-flight signal that gauges the plasma size and quantity of trapped electrons. This plasma expands at a rate that fits with an electron temperature as low as 5 K, colder that typically observed for atomic ultracold plasmas. The recombination of molecular NO + cations with electrons forms neutral molecules excited by more than twice the energy of the NO chemical bond, and the question arises whether neutral fragmentation plays a role in shaping the redistribution of energy and particle density that directs the short-time evolution from Rydberg gas to plasma. To explore this question, we adapt a coupled rate-equations model established for atomic ultracold plasmas to describe the energy-grained avalanche of electron-Rydberg and electron-ion collisions in our system. Adding channels of Rydberg predissociation and two-body, electron-cation dissociative recombination to the atomic formalism, we investigate the kinetics by which this relaxation distributes particle density and energy over Rydberg states, free electrons and neutral fragments. The results of this investigation suggest some mechanisms by which molecular fragmentation channels can affect the state of the plasma.

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Section: Electron Impactmentioning

confidence: 99%

On the formation and decay of a molecular ultracold plasma

Saquet

Morrison

Schulz-Weiling

et al. 2011

J. Phys. B: At. Mol. Opt. Phys.

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“…30 Recording photoelectron spectra at these resonant energies may extend the vibrational profile of the first NO band at least as far as the onset of the second band ͑15.65 eV͒. 28 Therefore, NO was also studied separately by recording CIS spectra at positions of the ͓NO ϩ (X 1 ⌺ ϩ ), v ϩ ϭ14, 15, and 16]←͓NO(X 2 ⌸),vЉϭ0͔ ionizations ͑at ionization energies of 12.96, 13.17, and 13.42 eV͒ and at ionization energies used to record the OH and OD CIS spectra ͑13.01, 13.27, 13.38, and 15.17 eV͒.…”

Section: Resultsmentioning

confidence: 97%

Study of the OH and OD radicals with photoelectron spectroscopy using synchrotron radiation

Barr¹,

Fanis²,

Dyke³

et al. 1999

The Journal of Chemical Physics

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Photoionization of the OH and OD radicals, produced from the H+NO2 and D+NO2 reactions, has been studied in the gas phase in the photon energy region 13.0–17.0 eV using constant ionic state (CIS) and photoelectron spectroscopy (PES) employing synchrotron radiation. Structure in the CIS spectra, recorded for the first and second photoelectron bands, has been assigned to excitation to (a 1Δ,3d) and (A 3Π,3d) Rydberg states. A comparison of vibrationally specific OH and OD CIS spectra, and photoelectron spectra recorded at resonant wavelengths, has allowed a more complete assignment of structure observed in earlier photoionization mass spectrometric measurements. These assignments have been supported by the results of Franck–Condon calculations. The CIS spectra have been shown to be dominated by structure arising from excitation from the outermost valence molecular orbitals of OH [the nonbonding 1π(O 2p) orbital and the bonding 3σ orbital] to O nd Rydberg orbitals. Photoelectron spectra recorded for the first bands of OH and OD at resonant photon energies have allowed more extensive vibrational structure to be obtained than has previously been recorded by PES experiments performed with inert gas discharge photon sources.

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“…With regard to experimental works, the energy levels of NO below the first ionization threshold have been studied extensively and well summarized by Huber and Herzberg [15]. As for the energy levels of NO above the first ionization threshold, Erman et al [11] have analyzed and classified the Rydberg series converging to all known states of NO + below 24 eV, except the one converging to singlet ionization threshold of a 4 electron. Recently, a number of peaks observed in the fluorescence spectrum in the energy region of 17.2-25.8 eV were assigned to "new" NO states since they showed a poor coincidence with the known NO Rydberg levels or other molecular states [9].…”

Section: ͑1͒mentioning

confidence: 99%

“…Meanwhile, there is increasing interest about the dynamics of superexcited states because superexcited states play an important role as reaction intermediates in a variety of collision processes such as electron-ion and ionion recombinations, Penning ionization, and electron attachment processes [5,6,8]. The three most commonly used methods to investigate the structure of superexcited states are the fluorescence spectroscopy emitted from neutral fragments, the photoelectron spectroscopy, and the photoion spectroscopy [7,[9][10][11], each of which is related to one specific decay process of superexcited states. However, the spectra measured by angle-resolved electron-energy-loss spectroscopy include all possible decay processes for a specific state.…”

Section: ͑1͒mentioning

confidence: 99%

Superexcited states ofNOstudied by angle-resolved electron-energy-loss spectroscopy

et al. 2004

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Absolute double differential cross section spectra of NO below 135 eV have been determined by an angleresolved electron-energy-loss spectrometer with an incident electron energy of 2500 eV and an energy resolution of 100 meV. Some features above the first ionization threshold, which are too weak to be observed in the photoabsorption spectrum, stand out at large scattering angles. The present measured features and those unassigned ones in the fluorescence spectra [Chem. Phys. 293, 65 (2003)] are assigned based on the present experimental work and theoretical analysis. The energy levels of 4 −1 ͑c 3 ⌸͒ns͑n =3-5͒, 4 −1 ͑B 1 ⌸͒ns͑n =3-5͒, a vibrational resolved doubly excited state, and the inner-valence transition 2 ← 3 are determined. Meanwhile, the ionization threshold ͑22.1 eV͒ of ͑4͒ −1 B 1 ⌸ is estimated.

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Photoionization and photodissociation of nitric oxide in the range 9–35 eV

Cited by 49 publications

References 39 publications

On the formation and decay of a molecular ultracold plasma

On the formation and decay of a molecular ultracold plasma

Study of the OH and OD radicals with photoelectron spectroscopy using synchrotron radiation

Superexcited states ofNOstudied by angle-resolved electron-energy-loss spectroscopy

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