Photodissociation of an Internally Cold Beam of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>CH</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>Ions in a Cryogenic Storage Ring

O'Connor, Aodh; Becker, Andreas; Blaum, Klaus; Breitenfeldt, Christian; George, Sebastian; Göck, Jürgen; Grieser, M.; Grussie, Florian; Guerin, E. A.; Hahn, R. von; Hechtfischer, Ulrich; Herwig, P.; Karthein, Jonas; Krantz, Claude; Kreckel, H.; Lohmann, Svenja; Meyer, Christian F.; Mishra, P M; Novotný, Oldřich; Repnow, R.; Saurabh, S.; Schwalm, D.; Spruck, K.; Kumar, Sunil; Vogel, Stephen; Wolf, A.

doi:10.1103/physrevlett.116.113002

Cited by 37 publications

(21 citation statements)

References 27 publications

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“…Figure 3b shows two photodissociation spectra measured near the thresholds for J = 0-2 states for two different storage time intervals. The spectra can be fitted remarkably well with linear combinations of the calculated cross sections for individual J values, yielding the time-dependent population for each rotational state [21]. The measurements revealed the expected spontaneous decay pattern, compatible with the known dipole moment of CH + and an effective blackbody radiation field with a temperature of (20 ± 5) K. Since the CH + experiment was very challenging from a technical point of view (the UV laser light blinded the cryogenic detectors), only storage times up to 240 s were sampled, which was too short to reach equilibrium.…”

Section: Cooling Of Internal Degrees Of Freedommentioning

confidence: 93%

Astrochemical studies at the Cryogenic Storage Ring

Kreckel

Novotný

Wolf

2019

Phil. Trans. R. Soc. A.

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The new Cryogenic Storage Ring at the Max Planck Institute for Nuclear Physics (Heidelberg, Germany) has recently become operational. One of the main research areas foreseen for this unique facility is astrochemical studies with cold molecular ions. The spontaneous radiative cooling of the prototype interstellar molecule CH + to its lowest rotational states has been demonstrated by photodissociation spectroscopy, paving the way for experiments under true interstellar conditions. To this end, a low-energy electron cooler and a neutral atom beam set-up for merged beams studies have been constructed. These experiments have the potential to provide energy-resolved rate coefficients for fundamental astrochemical processes involving state-selected molecular ions. The main target reactions include some of the key processes of interstellar chemistry, such as the electron recombination of H 3 + , charge exchange between H 2 + and H, or the formation of CH + in collisions of triatomic hydrogen ions and C atoms. This article is part of a discussion meeting issue ‘Advances in hydrogen molecular ions: H 3 + , H 5 + and beyond’.

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Section: Cooling Of Internal Degrees Of Freedommentioning

confidence: 93%

Astrochemical studies at the Cryogenic Storage Ring

Kreckel

Novotný

Wolf

2019

Phil. Trans. R. Soc. A.

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“…In addition to providing such an extreme vacuum condition, the cryogenic cooling of the ring opens a new opportunity to study the molecular structure and reaction dynamics in the absence of excitation by blackbody radiations. Radiative cooling of the molecular ions into the rovibrational ground state during storage have already been demonstrated in the cryogenic storage rings DESIREE [2] and CSR [3,4].…”

Section: Introductionmentioning

confidence: 98%

Status of the Laser Spectroscopy and Merged-beam Experiments at RICE

Nakano

Igosawa

Iida

et al. 2021

Proceedings of 10th International Conference on Nuclear Physics at Storage Rings (STORI’17)

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“…In the last decade, many studies have been devoted to the evolution of the internal energy distribution (IED) of highly isolated polycyclic aromatic hydrocarbon (PAH), linear hydrocarbons (C n H m ), fullerene, and metallic cluster molecules [1][2][3][4][5][6]. The knowledge on the IED concerning the PAHs is of particular interest in the estimation of the minimum size of stable PAH molecules irradiated under UV in the interstellar medium (ISM) [7].…”

Section: Introductionmentioning

confidence: 99%

“…Experiments using recent electrostatic storage rings (ESRs) are suited to measure slow processes such as delayed dissociation, cooling by infrared (IR), and delayed fluorescence emission. The evolution of the IED of molecules can be measured using the "action spectroscopy" technique over a large range from microseconds to seconds especially with cryogenic ESR rings [3,8]. It is well known that hot molecules release their internal energy mainly by dissociation and radiative processes.…”

Section: Introductionmentioning

confidence: 99%

Fragmentation and cooling of doubly charged anthracene studied in an electrostatic storage ring

et al. 2019

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The cooling of anthracene dications (C 14 H 10 ) 2+ has been studied in a time range of 10 ms. Intact (C 14 H 10 ) 2+ ions were produced in a Nanogan electron cyclotron resonance (ECR) ion source and stored in a compact electrostatic ion storage ring, the Mini-Ring. The internal energy distribution of the stored dications was probed every millisecond during the storage time using optical parametric oscillator (OPO) nanosecond laser pulses. The wavelength of the laser was tuned at 560 nm (2.214 eV), which is the center of a broad resonance peak attributed to the S 2 -S 0 transition of (C 14 H 10 ) 2+ . The fast decay of neutral fragment counts due to laser induced dissociation was recorded for several probing times. These experimental neutral decay curves were reproduced by a model that accounted for the slow evolution of the internal energy distribution of the stored ions due to dissociation and radiative cooling processes. From the simulated internal energy distributions, we have estimated an energy shift rate varying from 140 to 30 eV/s in the time range from 1 to 9 ms, which was attributed mainly to the radiative cooling due to delayed electronic transitions. The electronic fluorescence rate was estimated to 331 s −1 for an internal energy of 7 eV, which was similar to the electronic fluorescence rate of an anthracene cation at the same energy. We conclude that, for anthracene, the fluorescence cooling process is not sensitive to the charge of the molecule for low charge states, cation and dication.

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Photodissociation of an Internally Cold Beam ofCH+Ions in a Cryogenic Storage Ring

Cited by 37 publications

References 27 publications

Astrochemical studies at the Cryogenic Storage Ring

Astrochemical studies at the Cryogenic Storage Ring

Status of the Laser Spectroscopy and Merged-beam Experiments at RICE

Fragmentation and cooling of doubly charged anthracene studied in an electrostatic storage ring

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