Time evolution of internal energy distribution of Anthracene studied in an electrostatic storage ring, the Mini-Ring

Chen, L; Ji, MingChao; Bernard, J.; Brédy, R.; Concina, B; Joblin, C.; Ortéga, C; Montagne, G; Martin, S.

doi:10.1088/1742-6596/488/1/012039

Cited by 3 publications

(6 citation statements)

References 8 publications

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“…The experiment consists in storing naphthalene cations (C 10 H 8 + ) in an electrostatic storage ring, the Mini-Ring, whose characteristics were described in details in papers [10,11]. Naphthalene molecules were ionized and heated in an Electron Cyclotron Resonance (ECR) ion source with a broad initial internal energy distribution, and accelerated to 12 keV.…”

Section: Experimental Set-upmentioning

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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Section: Experimental Set-upmentioning

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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“…After dissociation, the daughter ions were quickly ejected out of the ring due to the decrease of their kinetic energy which did not fulfil the stable storage conditions anymore. For anthracene cations previous results indicates that the dissociation process is quenched by the radiative cooling for time t>3ms [14,15]. Therefore, if collisions with the residual gas is neglected, for time t>3ms further evolution of the high energy part of the IED can be attributed to the radiative cooling.…”

Section: Radiative Cooling Of Anthracene Cationsmentioning

confidence: 92%

“…The radiative cooling of PAH was studied using an electrostatic ion storage ring, the Mini-Ring [14][15][16][17]. Anthracene molecules (C 14 H 10 ) were ionized in an Electron Cyclotron Resonance (ECR) ion source creating an ensemble of ions with a broad IED.…”

Section: Radiative Cooling Of Anthracene Cationsmentioning

confidence: 99%

“…To ensure single photon absorption condition, the pulse energy was controlled to be about 300 µJ/pulse. As discussed in [15] the laser wavelength has to be chosen carefully in order to bring the high-energy edge of the IED inside the sensitive energy window of the experiment. Indeed, the decay of the enhanced neutral yield induced by the photon absorption and detected with the MiniRing setup was sensitive only to dissociation processes of anthracene cations with energy between 9 and 10.5 eV.…”

Section: Radiative Cooling Of Anthracene Cationsmentioning

confidence: 99%

“…They needed to include the electronic transition process in their numerical simulations in order to reproduce the measured photofragmentation efficiency curve of the cold trapped ions after irradiation with a continuous and filtered visible light emitted from a Xenon arc lamp. The fast cooling rate of anthracene cation could be measured only recently by following the time evolution of the internal energy distribution (IED) of an ensemble of ions stored inside a storage ring [14,15].…”

Section: Introductionmentioning

confidence: 99%

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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 of isolated anthracene cations probed with photons of different wavelengths in the Mini-Ring

Bernard

Chen

et al. 2017

The Journal of Chemical Physics

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We report on a direct measurement of the Internal Energy Distribution (IED) shift rate of an initially hot polycyclic aromatic hydrocarbon (PAH) molecular ensemble, anthracene cations (CH). The ions were produced in an electron cyclotron resonance (ECR) ion source and stored in an electrostatic ion storage ring, the Mini-Ring. Laser pulses of two wavelengths were sent successively to merge the stored ion bunch at different storage times to enhance the neutral fragment yield due to fast laser induced dissociation. Using this technique, we have been able to determine directly the energy shift rate of the IED, without involving any theoretical simulation or any assumption on dissociation rates, cooling rates, or the initial IED. Theoretical energy shift rates have been estimated from the evolution of simulated IEDs by taking into account the effects of the unimolecular dissociation and two radiative decay mechanisms: the Poincaré fluorescence and the infrared vibrational emission. The comparison between the experimental results and the model provides new evidence of the important role of the Poincaré fluorescence in the overall cooling process of anthracene cations. Although in the short time range the commonly accepted intuition says that the cooling would result mostly from the dissociation of the hottest ions (depletion cooling), we demonstrate that the Poincaré fluorescence is the dominant contribution (about 85%) to the net cooling effect.

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Time evolution of internal energy distribution of Anthracene studied in an electrostatic storage ring, the Mini-Ring

Cited by 3 publications

References 8 publications

The cooling of naphthalene cations studied within an electrostatic storage ring

The cooling of naphthalene cations studied within an electrostatic storage ring

PAH radiative cooling and fragmentation kinematics studied within an electrostatic ring

Cooling of isolated anthracene cations probed with photons of different wavelengths in the Mini-Ring

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