Spectroscopy and ion thermometry of 
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 using laser-cooling transitions

Nötzold, Markus; Wild, R. J.; Lochmann, Christine; Wester, Roland

doi:10.1103/physreva.106.023111

Cited by 6 publications

(6 citation statements)

References 59 publications

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“…This, combined with buffer-gas cooling, makes it a perfect tool for probing cold chemistry . A detailed description of the setup can be found elsewhere, , here, we will summarize the most important aspects.…”

Section: Methodsmentioning

confidence: 99%

Three-Body Collisions Driving the Ion–Molecule Reaction C₂^– + H₂ at Low Temperatures

et al. 2023

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We report on the three-body reaction rate of C2 – with H2 producing C2H– studied in a cryogenic 16-pole radio frequency ion trap. The reaction was measured in the temperature range from 10 to 28 K, where it was found to only take place via three-body collisions. The experimentally determined termolecular rate coefficient follows the form of a · ( T / T 0 ) b with T 0 = 20 K, where a = 8.2(3) × 10–30 cm6/s and b = −0.82(12) denotes the temperature dependence. We additionally performed accurate ab initio calculations of the forces between the interacting partners and carried out variational transition state theory calculations, including tunneling through the barrier along the minimum energy path. We show that, while a simple classical model can generally predict the temperature dependence, the variational transition state theoretical calculations, including accurate quantum interactions, can explain the dominance of three-body effects in the molecular reaction mechanism and can reproduce the experimentally determined reaction coefficients, linking them to a temperature-dependent coupling parameter for energy dissipation within the transition complex.

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Section: Methodsmentioning

confidence: 99%

Three-Body Collisions Driving the Ion–Molecule Reaction C₂^– + H₂ at Low Temperatures

et al. 2023

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“…We will assume that the kinetic energy distribution of the trapped ions is close to a Maxwell-Boltzmann distribution and can be characterized by the kinetic temperature T kin . The kinetic temperature of stored ions under particular experimental conditions can be characterized by measuring the Doppler broadening of suitable absorption lines of trapped ions (Glosík et al 2006;Jusko et al 2014;Kovalenko et al 2021;Nötzold et al 2022).…”

Section: Reactant Temperaturementioning

confidence: 99%

Isotope Exchange Reaction of OH⁻ Anion with HD at Temperatures from 15 K up to 300 K: Ion Trap Study

Plašil,

Uvarova,

Rednyk

et al. 2023

ApJ

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This paper presents the results of an experimental study of the reaction of OH− anions with HD molecules leading to the formation of OD− anions. The study’s main goal was to obtain the temperature dependence of the reaction rate coefficient and determine the reaction’s enthalpy. This study was carried out at astrophysically relevant temperatures from 15 to 300 K. The reaction was studied using a temperature-variable cryogenic linear 22-pole radio-frequency ion trap. The rotational temperature of the OH− anions in the ion trap was characterized by near-threshold photodetachment spectroscopy. At 15 K, the measured reaction rate coefficient is 5 × 10−10 cm3 s−1. With increasing temperature, the reaction rate coefficient decreases monotonically to 5 × 10−11 cm3 s−1 at 300 K. Comparing with the previously determined rate coefficient of the reverse reaction of OD− anions with H2, we obtained the temperature dependence of the equilibrium constant. The enthalpy and entropy of the title reaction were determined in the studied temperature range as ΔH = (−23.9 ± 0.7 ± 2.6sys) meV and ΔS = (−8.5 ± 1.2 ± 1.4sys) J mol−1 K−1, respectively.

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“…Much experimental work on C 2 − has addressed the valence shell using a number of spectroscopic techniques [31–39] . Recently, C 2 − has been identified as a promising molecular species for laser cooling, [40] and the corresponding transitions have been studied with high precision [41] . In the present study, we have measured relative cross sections for 1 s inner‐shell photo–double‐detachment (PDD) of C 2 − anions, i. e., for the process

\vcenter{\openup.5em\halign{$\displaystyle{#}$\cr h\nu + {\rm{C}}_2^ - \to {\rm{C}}_2^ + + 2e^ - .\hfill\cr}}

…”

Section: Introductionmentioning

confidence: 99%

“…[31][32][33][34][35][36][37][38][39] Recently, C 2 À has been identified as a promising molecular species for laser cooling, [40] and the corresponding transitions have been studied with high precision. [41] In the present study, we have measured relative cross sections for 1s inner-shell photo-double-detachment (PDD) of C 2 À anions, i. e., for the process…”

Section: Introductionmentioning

confidence: 99%

Vibrationally Resolved Inner‐Shell Photoexcitation of the Molecular Anion C₂⁻

Schippers

Hillenbrand

Perry‐Sassmannshausen

et al. 2023

ChemPhysChem

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Carbon 1s core-hole excitation of the molecular anion C 2 À has been experimentally studied at high resolution by employing the photon-ion merged-beams technique at a synchrotron light source. The experimental cross section for photo-doubledetachment shows a pronounced vibrational structure associated with 1s u ! 3s g and 1s g ! 1p u core excitations of the C 2 À ground level and first excited level, respectively. A detailed Franck-Condon analysis reveals a strong contraction of the C 2 À molecular anion by 0.2 Å upon this core photoexcitation. The associated change of the molecule's moment of inertia leads to a noticeable rotational broadening of the observed vibrational spectral features. This broadening is accounted for in the present analysis which provides the spectroscopic parameters of the C 2 À 1s À 1 u 3s 2 g 2 S þ u and 1s À 1 g 3s 2 g 2 S þ g core-excited levels.

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Spectroscopy and ion thermometry of C2− using laser-cooling transitions

Cited by 6 publications

References 59 publications

Three-Body Collisions Driving the Ion–Molecule Reaction C₂^– + H₂ at Low Temperatures

Three-Body Collisions Driving the Ion–Molecule Reaction C₂^– + H₂ at Low Temperatures

Isotope Exchange Reaction of OH⁻ Anion with HD at Temperatures from 15 K up to 300 K: Ion Trap Study

Vibrationally Resolved Inner‐Shell Photoexcitation of the Molecular Anion C₂⁻

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Spectroscopy and ion thermometry of C2− using laser-cooling transitions

Cited by 6 publications

References 59 publications

Three-Body Collisions Driving the Ion–Molecule Reaction C2– + H2 at Low Temperatures

Three-Body Collisions Driving the Ion–Molecule Reaction C2– + H2 at Low Temperatures

Isotope Exchange Reaction of OH− Anion with HD at Temperatures from 15 K up to 300 K: Ion Trap Study

Vibrationally Resolved Inner‐Shell Photoexcitation of the Molecular Anion C2−

Contact Info

Product

Resources

About

Three-Body Collisions Driving the Ion–Molecule Reaction C₂^– + H₂ at Low Temperatures

Three-Body Collisions Driving the Ion–Molecule Reaction C₂^– + H₂ at Low Temperatures

Isotope Exchange Reaction of OH⁻ Anion with HD at Temperatures from 15 K up to 300 K: Ion Trap Study

Vibrationally Resolved Inner‐Shell Photoexcitation of the Molecular Anion C₂⁻