Cooling Dynamics of Photoexcited<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:msub><mml:mi mathvariant="normal">C</mml:mi><mml:mn>6</mml:mn></mml:msub><mml:mo>−</mml:mo></mml:msup></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub><mml:msup><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow>

Ito, Gen; Furukawa, T.; Tanuma, H.; Matsumoto, Jun; Shiromaru, H.; Majima, T.; Goto, M.; Azuma, T.; Hansen, Klavs

doi:10.1103/physrevlett.112.183001

Cited by 65 publications

(44 citation statements)

References 27 publications

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“…This type of radiation was proposed a long time ago [32,33] but was only recently detected for several excited carbon species [19,25,34,35] and very recently also confirmed by direct detection of emitted photons for C 6 − [36].…”

Section: Fig 4 Fits Of the Radiative Cooling Time Constant With Eqmentioning

confidence: 99%

Thermal radiation of gold clusters on microsecond time scales

et al. 2017

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Small positively charged gold clusters have been found to emit thermal radiation at a very high rate, with time constants ranging from one to 35 μs for Au n + (n = 6-13,15). For sizes n = 14,16-20 the radiation occurs on much longer time scales. Strong thermal suppression of the population of higher-lying states puts constraints on the possible energies of excited states that can contribute to the radiation. Taking that into account, an evaluation of the experimentally determined rate constants shows that the strong radiation originates from thermally excited low-lying electronic states hitherto not observed. The origin of these states is discussed and two possibilities are suggested: one is related to electron correlation and electron pairing, and the other results from thermal shape fluctuations.

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Section: Fig 4 Fits Of the Radiative Cooling Time Constant With Eqmentioning

confidence: 99%

Thermal radiation of gold clusters on microsecond time scales

et al. 2017

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“…This fast process involves inverse internal conversion (IIC) and relies on the fast electronic fluorescence from low lying electronic states. Recently, evidence of this fast electronic cooling mechanism was observed using electrostatic storage ring (ESR) in the case of anthracene cation (C 14 H 10 + ) [7] and hot small molecular anions C -6 [8]. In earlier works, many other molecules and clusters have been studied within ESRs, like ELISA in Aarhus, which appeared to be very efficient to study the relaxation dynamics of complex systems in a long time range from microsecond to second [9].…”

Section: Introductionmentioning

confidence: 99%

The cooling of naphthalene cations studied within an electrostatic storage ring

Ortéga

Brédy

Chen

et al. 2015

J. Phys.: Conf. Ser.

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Time evolution of the internal energy distribution of singly charged anthracene in a storage ring M Ji, R Brédy, L Chen et al.Time Evolution of the internal energy distribution of molecules studied in an electrostatic storage ring, the Mini-Ring L Chen, C Ortéga, M Ji et al. Abstract. Fast population decay of naphthalene cations (C 10 H 8 + ) has been observed in a compact electrostatic storage ring, the Mini-Ring, up to 5 ms. Laser induced dissociation due to single-photon absorption was used to probe the internal energy distribution (IED) of the stored molecular ions as a function of the storage time. To determine the energy distribution of naphthalene cations, the experimental neutral decay curve was analysed with a model including the competition between dissociation and radiative cooling. Fast cooling rates from about 70 s −1 at the internal energy 5.6 eV to 140 s −1 at 6.2 eV were measured and compared with the data in the literature. This fast cooling mechanism is attributed to the fluorescence from thermally excited electrons and may have important implications in astrophysics for the lifetime and the critical size of Polycyclic Aromatic Hydrocarbons (PAH) in the interstellar medium.

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“…Results obtained on naphthalene cation corroborated this interpretation. The importance of low lying electronic states in the radiative cooling process was also confirmed very recently by the observation of a drastic change in the cooling of small anion clusters C 6 -and C 6 H - [13].…”

Section: Radiative Cooling Of Anthracene Cationsmentioning

confidence: 63%

“…For PAH the average IR radiative cooling rate has been calculated to be of the order of 2 s -1 nearly independent on the size and internal energy of the PAH [11]. However, evidences of fast radiative cooling have been observed very recently for anion clusters [12,13] and anthracene cations [14] using ion storage techniques. This fast cooling was attributed to fluorescence emission from low lying electronic excited states predicted by Leger et al [7,11].…”

Section: Introductionmentioning

confidence: 99%

PAH radiative cooling and fragmentation kinematics studied within an electrostatic ring

Brédy

Ortéga

et al. 2015

J. Phys.: Conf. Ser.

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Abstract. Radiative cooling of polycyclic aromatic hydrocarbon (PAH) cations has been studied using a compact electrostatic ion storage ring, the Mini-Ring, in a time range up to 8 ms. The time evolution of the internal energy distribution of the ensemble of stored ions shows evidences of fast cooling which is attributed to the fluorescence from thermally excited electronic states. The internal energy distribution was probed by inducing unimolecular dissociation with single-photon absorption at given storage times. Information on the fragmentation kinematics and the dissociation channels were obtained by analyzing the image of the emitted neutrals detected with a time and position sensitive detector.

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Cooling Dynamics of PhotoexcitedC6−andC6H

Cited by 65 publications

References 27 publications

Thermal radiation of gold clusters on microsecond time scales

Thermal radiation of gold clusters on microsecond time scales

The cooling of naphthalene cations studied within an electrostatic storage ring

PAH radiative cooling and fragmentation kinematics studied within an electrostatic ring

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