From Rydberg State Dynamics to Ion‐Molecule Reactions using Zeke Spectroscopy

Softley, T. P.; Mackenzie, Stuart R.; Merkt, Frédéric; Rolland, D.

doi:10.1002/9780470141601.ch25

Cited by 9 publications

(2 citation statements)

References 49 publications

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“…This field is not large enough to field ionize the n = 18 or 19 Rydberg states directly, and the observation of a small signal shows that n-changing up-conversion processes to n > 25 have occurred for a small fraction of the populated states in the period between excitation and field ionization, presumably through collisional effects or possibly blackbody-radiation-induced excitation. Similar effects have been observed previously [18] and are not uncommon in multiphoton excitation experiments, especially where the background ion density in the excitation volume can be quite high. Nevertheless, the magnitude of the signal is sufficiently small that the images we report subsequently may be considered to be have only very minor contributions from this effect.…”

Section: Stark Spectroscopysupporting

confidence: 85%

Deflection of krypton Rydberg atoms in the field of an electric dipole

Townsend¹,

Goodgame²,

Procter³

et al. 2001

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

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The controlled deflection of Rydberg atoms in an inhomogeneous electric field is demonstrated and shown to be in agreement with predictions based on a well-defined Stark map. Krypton atoms in a supersonic beam are excited in a two-colour multiphoton process to selected Stark states with n = 16-19 and undergo deflections in the field of an electrostatic dipole. The spatial distribution of the deflected atoms is monitored by ion imaging. The atoms travelling ~10 cm in the beam direction after excitation are deflected from the beam axis by distances of up to 3 mm, the interaction with the field taking place over 40 µs. Simulations of the trajectories agree well with the experimental results, demonstrating that the detected Rydberg atoms are those which have not undergone decay processes in the 40 µs applied field.

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Section: Stark Spectroscopysupporting

confidence: 85%

Deflection of krypton Rydberg atoms in the field of an electric dipole

Townsend¹,

Goodgame²,

Procter³

et al. 2001

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

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“…Rotational intensities largely reflect the rotational population in the seeded supersonic NO 2 beam; thus, the resulting NO 2 + rotational distribution should be similar for all NO 2 + vibrational states, with a significant population only for E rot < ∼10 meV. Because E rot is roughly constant and small compared to our collision and vibrational energies, no rotational effects are expected, [23][24][25][26][27][28] and we made no attempt to either assign or vary the ion rotational levels produced.…”

Section: Resultsmentioning

confidence: 99%

State-Selective Preparation of NO₂⁺ and the Effects of NO₂⁺ Vibrational Mode on Charge Transfer with NO

2005

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Two color resonance-enhanced multiphoton ionization (REMPI) scheme of NO(2) through the E (2)Sigma(u)(+) (3psigma) Rydberg state was used to prepare NO(2)(+) in its ground and (100), (010), (02(0)0), (02(2)0), and (001) vibrational states. Photoelectron spectroscopy was used to verify >96% state selection purity, in good agreement with results of Bell et al. for a similar REMPI scheme. The effects of NO(2)(+) vibrational excitation on charge transfer with NO have been studied over the center-of-mass collision energy (E(col)) range from 0.07 to 2.15 eV. Charge transfer is strongly suppressed by collision energy at E(col) < approximately 0.25 eV but is independent of E(col) at higher energies. Mode-specific vibrational effects are observed for both the integral and differential cross-sections. The NO(2)(+) bending vibration strongly enhances charge transfer, with enhancement proportional to the bending quantum number, and is not dependent on the bending angular momentum. The enhancement results from increased charge transfer probability in large impact parameter collisions that lead to small deflection angles. The symmetric stretch also enhances reaction at low collision energies, albeit less efficiently than the bend. The asymmetric stretch has virtually no effect, despite being the highest-energy mode. A model is proposed to account for both the collision energy and the vibrational state dependence.

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Threshold photoionization in time‐of‐flight mass spectrometry

Braun

Neusser

2002

Mass Spectrometry Reviews

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Multi-photon excitation in a time-of-flight mass spectrometer (TOF-MS) is shown to lead to threshold ions with defined internal energy. A powerful technique for the production of threshold ions is based on the excitation of high long-lived Rydberg states embedded in the ionization continuum. The Rydberg molecules are separated with suitable separation techniques from ions produced by a direct multi-photon ionization process. Finally, the ionization of the Rydberg molecules in a delayed pulsed electric field leads to threshold ions. This work reviews several separation techniques, and reports on applications of threshold ionization for investigation of the structure, energetics, and dynamics of neutral molecules, molecular cations, and cluster cations.

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From Rydberg State Dynamics to Ion‐Molecule Reactions using Zeke Spectroscopy

Cited by 9 publications

References 49 publications

Deflection of krypton Rydberg atoms in the field of an electric dipole

Deflection of krypton Rydberg atoms in the field of an electric dipole

State-Selective Preparation of NO₂⁺ and the Effects of NO₂⁺ Vibrational Mode on Charge Transfer with NO

Threshold photoionization in time‐of‐flight mass spectrometry

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From Rydberg State Dynamics to Ion‐Molecule Reactions using Zeke Spectroscopy

Cited by 9 publications

References 49 publications

Deflection of krypton Rydberg atoms in the field of an electric dipole

Deflection of krypton Rydberg atoms in the field of an electric dipole

State-Selective Preparation of NO2+ and the Effects of NO2+ Vibrational Mode on Charge Transfer with NO

Threshold photoionization in time‐of‐flight mass spectrometry

Contact Info

Product

Resources

About

State-Selective Preparation of NO₂⁺ and the Effects of NO₂⁺ Vibrational Mode on Charge Transfer with NO