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- Furukawa, T., et al.
(author)
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Cooling dynamics of photo-excited negative carbon cluster ions stored in an ion storage ring
- 2015
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In: Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms. - : Elsevier BV. - 0168-583X. ; 354, s. 192-196
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Journal article (peer-reviewed)abstract
- A newly found fast radiative cooling process of C-6(-) is studied by simulation based on statistical sharing of the internal energy by the vibrational modes both in the electronic ground and excited states. For comparison, a contrasting slow cooling of C6H- is simulated by the same procedure. The simulation demonstrates a distinct difference in the time evolution of energy distributions between C-6(-) and C6H-, and well reproduces the observed fast cooling of C-6(-) by recurrent electronic transitions and the slow cooling of C6H- by vibrational de-excitation. (C) 2014 Elsevier B.V. All rights reserved.
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| 11. |
- Kono, Naoko, et al.
(author)
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Electronic and vibrational radiative cooling of the small carbon clusters C4− and C6−
- 2018
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In: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947. ; 98:6
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Journal article (peer-reviewed)abstract
- Delayed electron detachment yields of C4− and C6− induced by photoexcitation in an electrostatic ion storage ring were measured as functions of excitation energies and laser firing times, allowing for a mapping of their radiative cooling in a wide energy range. The energy window concept and discrimination of one- and twophoton absorption are critical in understanding the obtained results. The experimentally obtained electronic and vibrational cooling rates were consistent with a simulation based on detailed-balance theory. The even-odd alternation of vibrational cooling rates, predicted from IR intensities, was also examined. We found that the larger anion cools faster, with no indication of an even-odd alternation.
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- Kono, N., et al.
(author)
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Inverse internal conversion in C4- below the electron detachment threshold
- 2015
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In: Physical Chemistry Chemical Physics - PCCP. - : Royal Society of Chemistry (RSC). - 1463-9076 .- 1463-9084. ; 17:38, s. 24732-24737
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Journal article (peer-reviewed)abstract
- Inverse internal conversion followed by recurrent fluorescence was observed as a fast decay (10 μs range) in the time profile of neutral yields from photo-excited C4- molecular ions. We also elucidated the contribution of such electronic radiative cooling to the C4- ions with internal energy far below the detachment threshold by an alternative novel approach, observing the laser wavelength and storage time dependence (ms range) of the total yield of the photo-induced neutrals.
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| 13. |
- Shiromaru, H., et al.
(author)
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Cooling dynamics of carbon cluster anions
- 2015
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In: Journal of Physics: Conference Series. - : IOP Publishing. - 1742-6596 .- 1742-6588. ; 635
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Journal article (peer-reviewed)abstract
- A series of ion storage experiments on small carbon cluster anions was conducted to understand size-dependent cooling processes. The laser-induced delayed electron detachment time profile show clear even/odd alternation due to the presence of the electronic cooling. The time evolution of the internal energy distribution was simulated for Cn- (n=4 to 7) with a common procedure taking vibrational and electronic cooling into account.
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| 14. |
- Suzuki, R., et al.
(author)
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Vibrational radiative cooling of isolated C4- and C6-
- 2017
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In: Journal of Physics: Conference Series. XXX International Conference on Photonic, Electronic, and Atomic Collisions (ICPEAC2017) 26 July to 1 August 2017, Cairns, Australia. - : IOP Publishing. - 1742-6588 .- 1742-6596.
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Conference paper (peer-reviewed)abstract
- We have observed the storage-time dependence of the laser-induced electron detachment yields for the linear carbon cluster anions C4- and C6− stored in an electrostatic ion storage ring (TMU E-ring) with several laser wavelengths. The electron detachment yield reflects the decrease of the internal energy of the stored ions. We succeeded in obtaining the time evolution of the excitation energy distribution below the first dipole-allowed electronic excited energy Eex for C4- and C6−, which was well consistent to the behavior explained by vibrational IR-radiative cooling.
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| 15. |
- Yoshida, M., et al.
(author)
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Detection of recurrent fluorescence photons emitted from C4
- 2017
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In: International conference on photonic electronic and atomic collisions 2017, 26 jul - 1 aug, Queensland, Australia. Journal of Physics, Conference Series 875:102016. - : IOP Publishing. - 1742-6588 .- 1742-6596.
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Conference paper (other academic/artistic)abstract
- We detected recurrent fluorescence photons from vibrationally hot C4- ions stored in an electrostatic ion storage ring. By virtue of the mass-independent storage condition, various anions produced in the laser ablation ion source were simultaneously stored with their own velocities, and ionic species emitting photons were identified from the temporal profile of the detected photons. The fluorescence synchronized with revolution of C4- , through the bandpass filter for the known absorption band, were clearly observed.
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| 16. |
- Chen, Fuqiang, et al.
(author)
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Radiative cooling of cationic carbon clusters, CN+, N=8,10,13-16
- 2019
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In: Physical Chemistry Chemical Physics - PCCP. - : Royal Society of Chemistry (RSC). - 1463-9076 .- 1463-9084. ; 21, s. 1587-1596
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Journal article (peer-reviewed)abstract
- The radiative cooling of highly excited carbon cluster cations of sizes N = 8, 10, 13–16 has been studied in an electrostatic storage ring. The cooling rate constants vary with cluster size from a maximum at N = 8 of 2.6 × 104 s−1 and a minimum at N = 13 of 4.4 × 103 s−1. The high rates indicate that photon emission takes place from electronically excited ions, providing a strong stabilizing cooling of the molecules.
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| 18. |
- Luis, R. S., et al.
(author)
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Demonstration of a 1 Pb/s spatial channel network node
- 2019
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In: IET Conference Publications. - : Institution of Engineering and Technology.
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Conference paper (peer-reviewed)abstract
- We experimentally demonstrate a petabit-class hierarchical SDM switching node with granularity from 10 Tb/s to 1 Pb/s. We address spatial bypassing network scenarios, optical channel grooming, spatial multiplex section protection switching, and optical channels using coupled and uncoupled spatial channels.
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