J/MNRAS/449/3323 (Li-He)+ collisions non-radiative processes (Belyaev+, 2015)
Full quantum study of non-radiative inelastic processes in lithium-helium
ion-atom collisions.
Belyaev A.K., Rodionov D.S., Augustovivcova L., Soldan P., Kraemer W.P.
<Mon. Not. R. Astron. Soc. 449, 3323 (2015)>
=2015MNRAS.449.3323B 2015MNRAS.449.3323B
ADC_Keywords: Atomic physics
Keywords: atomic data - atomic processes - molecular data - molecular processes
Abstract:
A full quantum study of non-radiative inelastic processes in
lithium-helium ion-atom collisions is presented. The study uses
the 13 lowest-lying electronic molecular states of LiHe+ of the
1Σ+, 3Σ+, 1Π, and 3Π symmetries.
Radial non-adiabatic coupling matrix elements between states of the
same symmetry are calculated. Quantum non-adiabatic nuclear dynamics
is studied by the reprojection method, which takes into account all
non-adiabatic couplings, including those that exhibit non-vanishing
asymptotic values. The energy dependence of the cross-sections and
temperature dependence of the rate coefficients for all partial
processes between the scattering channels is determined. It is shown
that the temperature dependence of rate coefficients for the
non-radiative and the radiative processes behave differently: the
non-radiative rate coefficients increase with increasing temperature,
while the radiative rate coefficients decrease. Consequently, in the
depopulation of the same scattering channel the non-radiative
processes dominate in high-temperature environments, whereas at low
temperature, such as in interstellar molecular clouds, the radiative
processes are typically more efficient.
Description:
Rate coefficients in cm3/s for inelastic Li + He^+ and Li^+ + He
collisions for temperatures from T=100K to 1000000K. Channel
numbers are defined in Table 1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 95 7 The lithium-helium ion-atom scattering channels,
the corresponding molecular states, and the
calculated and experimental asymptotic energies
tot_rate.dat 70 37 Total rate coefficients as a function of
temperature (table 2)
par_rate.dat 230 37 Partial rate coefficients as a function of
temperature (table 3)
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1 I1 --- Ch Channel number
3- 25 A23 --- ScCh Scattering channels
27- 77 A51 --- MS Molecular states
79- 86 F8.5 eV Ecal Calculation asymptotic energy (1)
88- 95 F8.5 eV Eexp Experiment asymptotic energy (2)
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Note (1): Soldan & Kraemer, 2012, Chemical Phys. 393, 135
Note (2): NIST (Kramida et al. 2014, NIST Atomic Spectra Database version 5.2,
see http://physics.nist.gov/asd) weighted average values.
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Byte-by-byte Description of file: tot_rate.dat
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Bytes Format Units Label Explanations
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1- 10 E10.1 K T Temperature (between 100K and 106K)
11- 20 E10.3 cm+3/s tcr2 Total rate coefficient for transitions from channel 2
21- 30 E10.3 cm+3/s tcr3 Total rate coefficient for transitions from channel 3
31- 40 E10.3 cm+3/s tcr4 Total rate coefficient for transitions from channel 4
41- 50 E10.3 cm+3/s tcr5 Total rate coefficient for transitions from channel 5
51- 60 E10.3 cm+3/s tcr6 Total rate coefficient for transitions from channel 6
61- 70 E10.3 cm+3/s tcr7 Total rate coefficient for transitions from channel 7
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Byte-by-byte Description of file: par_rate.dat
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Bytes Format Units Label Explanations
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1- 10 E10.1 K T Temperature (between 100K and 106K)
11- 20 E10.3 cm+3/s prc23 Partial rate coefficient for transition from 2 to 3
21- 30 E10.3 cm+3/s prc24 Partial rate coefficient for transition from 2 to 4
31- 40 E10.3 cm+3/s prc25 Partial rate coefficient for transition from 2 to 5
41- 50 E10.3 cm+3/s prc26 Partial rate coefficient for transition from 2 to 6
51- 60 E10.3 cm+3/s prc27 Partial rate coefficient for transition from 2 to 7
61- 70 E10.3 cm+3/s prc32 Partial rate coefficient for transition from 3 to 2
71- 80 E10.3 cm+3/s prc35 Partial rate coefficient for transition from 3 to 5
81- 90 E10.3 cm+3/s prc36 Partial rate coefficient for transition from 3 to 6
91-100 E10.3 cm+3/s prc42 Partial rate coefficient for transition from 4 to 2
101-110 E10.3 cm+3/s prc46 Partial rate coefficient for transition from 4 to 6
111-120 E10.3 cm+3/s prc47 Partial rate coefficient for transition from 4 to 7
121-130 E10.3 cm+3/s prc52 Partial rate coefficient for transition from 5 to 2
131-140 E10.3 cm+3/s prc53 Partial rate coefficient for transition from 5 to 3
141-150 E10.3 cm+3/s prc56 Partial rate coefficient for transition from 5 to 6
151-160 E10.3 cm+3/s prc62 Partial rate coefficient for transition from 6 to 2
161-170 E10.3 cm+3/s prc63 Partial rate coefficient for transition from 6 to 3
171-180 E10.3 cm+3/s prc64 Partial rate coefficient for transition from 6 to 4
181-190 E10.3 cm+3/s prc65 Partial rate coefficient for transition from 6 to 5
191-200 E10.3 cm+3/s prc67 Partial rate coefficient for transition from 6 to 7
201-210 E10.3 cm+3/s prc72 Partial rate coefficient for transition from 7 to 2
211-220 E10.3 cm+3/s prc74 Partial rate coefficient for transition from 7 to 4
221-230 E10.3 cm+3/s prc76 Partial rate coefficient for transition from 7 to 6
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Acknowledgements:
A.K. Belyaev, andrey.k.belyaev(at)gmail.com
(End) A.K. Belyaev [Herzen University], Patricia Vannier [CDS] 09-Mar-2015