Erratum: Rotationally Cold 
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 Ions in the Cryogenic Electrostatic Ion-Beam Storage Ring DESIREE [Phys. Rev. Lett. 
<b>119</b>
, 073001 (2017)]

Schmidt, H. T.; Eklund, Gustav; Chartkunchand, K. C.; Anderson, E. K.; Kamińska, Magdalena; Ruette, N. de; Thomas, Richard; Kristiansson, M. K.; Gatchell, Michael; Reinhed, Peter; Rosén, Stefan; Simonsson, Ansgar; Källberg, A.; Löfgren, Patrik; Mannervik, S.; Zettergren, Henning; Cederquist, H.

doi:10.1103/physrevlett.121.079901

Cited by 15 publications

(13 citation statements)

References 4 publications

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“…The symmetric storage ring used in this study is schematically illustrated in Figure 1. The vacuum chamber, electrostatic deflectors and detectors are cooled to ≈13 K by helium refrigerators, providing ultrahigh vacuum conditions that allow storage of keV ion beams for hours [32,33]. The target anions, C − 2n+1 (n = 3−5), were produced using a caesium sputtering ion source (National Electrostatics Corp., Madison, Wisconsin) with a graphite cathode.…”

Section: Methodsmentioning

confidence: 99%

Radiative cooling of carbon cluster anions C2n+1− (n = 3–5)

et al. 2020

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Radiative cooling of carbon cluster anions C2n+1− (n = 3–5) is investigated using the cryogenic electrostatic ion storage ring DESIREE. Two different strategies are applied to infer infrared emission on slow (milliseconds to seconds) and ultraslow (seconds to minutes) timescales. Initial cooling of the ions over the millisecond timescale is probed indirectly by monitoring the decay in the yield of spontaneous neutralization by thermionic emission. The observed cooling rates are consistent with a statistical model of thermionic electron emission in competition with infrared photon emission due to vibrational de-excitation. Slower cooling over the seconds to minutes timescale associated with infrared emission from low-frequency vibrational modes is probed using time-dependent action spectroscopy. For C9− and C11−, cooling is evidenced by the time-evolution of the yield of photo-induced neutralization following resonant excitation of electronic transitions near the detachment threshold. The cross-section for resonant photo-excitation is at least two orders of magnitude greater than for direct photodetachment. In contrast, C7− lacks electronic transitions near the detachment threshold. Graphical abstract

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Section: Methodsmentioning

confidence: 99%

Radiative cooling of carbon cluster anions C2n+1− (n = 3–5)

et al. 2020

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“…Generally, the collision-induced internal quenching is far more efficient for rotations than for vibrations, while vibrations are more efficiently quenched by radiative transitions. [9][10][11] In the present work we investigate the rotational quenching kinetics for a triatomic molecular ion. Recently we studied the absolute inelastic collision rate coefficient for the diatomic molecular anion OH À .…”

Section: Introductionmentioning

confidence: 99%

Collisional relaxation kinetics fororthoandparaNH₂⁻under photodetachment in cold ion traps

et al. 2018

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The collisional cooling of the internal rotational states of the nonlinear anion NH2- (1A1), occurring at the low temperature of a cold ion trap under helium buffer gas cooling, is examined via quantum dynamics calculations and ion decay rate measurements. The calculations employ a novel ab initio potential energy surface that describes the interaction anisotropy and range of action between the molecular anions and the neutral He atoms. The state changing integral cross sections are employed to obtain the state-to-state rate coefficients, separately for the ortho- and the para-NH2- ions. These rates are in turn used to compute the state population evolution in the trap for both species, once photodetachment by a laser is initiated in the trap. The present work shows results for the combined losses of both species after the photodetachment laser is switched on and analyzes the differences of loss kinetics between the two hyperfine isomers.

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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%