3 rd CRP β I.A.E.A., Vienna 2016 ROBERTO CELIBERTO Dipartimento di Ingegneria Civile, Ambientale, Edile, del Territorio e di Chimica Politecnico di Bari (Italy) and Istituto di Nanotecnologia - CNR, Bari (Italy) Elementary Processes and Thermodynamic Properties of Hydrogen and Helium Plasmas
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3rd CRP β I.A.E.A., Vienna 2016
ROBERTO CELIBERTO
Dipartimento di Ingegneria Civile, Ambientale, Edile, del Territorio e di Chimica
β’ Ionization degree from Saha equation (including self-energy and bound states)
β’ Lowering of the ionization potential at high densitiescauses full ionization (pressure ionization)
EXCITED-STATE KINETICS AND RADIATION TRANSPORT IN LOW-TEMPERATURE PLASMAS
THE SELF-CONSISTENT MODEL
G Colonna, G DβAmmando, LD Pietanza, M Capitelli,Plasma Physics & Controlled Fusion, 57, 014009 (2015)
Hydrogen and helium
1s2
EXCITED-STATE KINETICS AND RADIATION TRANSPORT IN LOW-TEMPERATURE PLASMAS
THE SELF-CONSISTENT MODEL
G Colonna, G DβAmmando, LD Pietanza, M Capitelli,Plasma Physics & Controlled Fusion, 57, 014009 (2015)
EXCITED-STATE KINETICS AND RADIATION TRANSPORT IN LOW-TEMPERATURE PLASMAS
SHOCK TUBE RESULTS: TEMPERATURES
G Colonna, G DβAmmando, LD Pietanza, M Capitelli,Plasma Physics & Controlled Fusion, 57, 014009 (2015)
EXCITED-STATE KINETICS AND RADIATION TRANSPORT IN LOW-TEMPERATURE PLASMAS
SHOCK TUBE RESULTS: LEVEL DISTRIBUTION AND EEDF
Ionization limit
n = 2 n = 2
Ionization limit
G Colonna, G DβAmmando, LD Pietanza, M Capitelli,Plasma Physics & Controlled Fusion, 57, 014009 (2015)
π+ πππ+ βΆππ+ ππ+
Quasi-Classical Trajectory (QCT) method
Quantum-Mechanical Close-Coupling (QM-CC) method
QCT ββ F. Esposito, C.M. Coppola, D. De Fazio J. Phys. Chem. A, 119, 12615 (2015).QM-CC ββ D. De Fazio, Phys. Chem. Chem. Phys., 16, 11662 (2014)
Exit channel
Ramachandran et al, Chem. Phys. Lett., 469, 26 (2009)
Entrance channel
Hβ¦H distance (a.u.)Heβ¦H distance (a.u.)
En
erg
y (
eV
)
H-H = 2.074 (a.u.)
He-H = 1.927 (a.u.)
He+H2+
HeH++H
MRCI (cc-pv5z)
Fitted at (M = 6)
Calculated
MRCI (cc-pv5z)
Fitted at (M = 6)
Calculated
π+ πππ+ βΆππ+ ππ+
(Gamallo et al,J Phys. Chem., 2104)
(Bovino et al, Astron. Astrophys., 2011)
QM-CC
QM-WP
QM-CS/NIP
QCT
π+ πππ+ βΆππ+ ππ+
QCT ββ F. Esposito, C.M. Coppola, D. De Fazio J. Phys. Chem. A, 119, 12615 (2015).QM-CC ββ D. De Fazio, Phys. Chem. Chem. Phys., 16, 11662 (2014)
(Rutherford & Vroom, J. Chem. Phys, 1973)Exp.
QM-CC
QCT
π+ πππ+ βΆππ+ ππ+
QCT ββ F. Esposito, C.M. Coppola, D. De Fazio J. Phys. Chem. A, 119, 12615 (2015).QM-CC ββ D. De Fazio, Phys. Chem. Chem. Phys., 16, 11662 (2014)
v = 0
QM-CC
Solid lines
QCT
Dashed lines
π+ πππ+ βΆππ+ ππ+
QCT ββ F. Esposito, C.M. Coppola, D. De Fazio J. Phys. Chem. A, 119, 12615 (2015).QM-CC ββ D. De Fazio, Phys. Chem. Chem. Phys., 16, 11662 (2014)
j = 0
v = 0v = 2
v = 4
Exp.: Rutherford & Vroom,J. Chem. Phys, 1973)
QCT results
π+ πππ+ βΆππ+ ππ+
QCT ββ F. Esposito, C.M. Coppola, D. De Fazio J. Phys. Chem. A, 119, 12615 (2015).QM-CC ββ D. De Fazio, Phys. Chem. Chem. Phys., 16, 11662 (2014)
QM-CC
Solid lines
QCT
Dashed lines
π+ πππ+ βΆππ+ ππ+
QCT ββ F. Esposito, C.M. Coppola, D. De Fazio J. Phys. Chem. A, 119, 12615 (2015).QM-CC ββ D. De Fazio, Phys. Chem. Chem. Phys., 16, 11662 (2014)
Billingβs semiclassical method:
β’ Classical description of the gas-phase atoms (trajectories)
β’ Quantum mechanical description of surface
β’ Recombination coefficient (gH) and probability are calculated
Unit cell for
W(110) plane
Cristal used in
the calculations
M. Rutigliano, D. Santoro and M. Balat-Pichelin, Surface Science, 628, 66 (2014)
Hydrogen recombination on tungsten at high temperature: experiment and molecular dynamics simulation
a
H-atom interaction
potentials
a
M. Rutigliano, D. Santoro and M. Balat-Pichelin, Surface Science, 628, 66 (2014)
H2-molecule interaction potential for T site
a
eV eV
H2-molecule interaction potential for T site
H
r
H
zH
xH
yH
a
eV eV
Hπππ β W 110 + Hπππ βΆ H2πππ +W(110)
Hπππ β W 110 + Hπππ βΆHπππ β W 110 + Hπππ
Hπππ β W 110 + Hπππ βΆHπππ β W 110 + Hπππ
Hπππ β W 110 + Hπππ βΆ Hπππ β W 110 +Hπππ β W 110
Hπππ β W 110 + Hπππ βΆHπππ +Hπππ +W 110
Hπππ β W 110 + Hπππ βΆ (H2)πππ β W 110
Molecular
recomb.
Ads/des
Exchange
Atomic
Ads
Molecular
ads
Des
Surface processes
The calculations have been performed for the 3F and T sites
Recom
bin
ation p
robabili
ty
Hπππ β W 110 + Hπππ βΆ H2πππ +W(110)
T = 1000 K
M. Rutigliano, D. Santoro and M. Balat-Pichelin, Surface Science, 628, 66 (2014)
M. Rutigliano, D. Santoro and M. Balat-Pichelin, Surface Science, 628, 66 (2014)
On the surface Above the surface
H atom trajectories
M. Rutigliano, D. Santoro and M. Balat-Pichelin, Surface Science, 628, 66 (2014)
πΎπ» =[Hrec]
[Htot]
M. Rutigliano, D. Santoro and M. Balat-Pichelin, Surface Science, 628, 66 (2014)
π¦ = 1.98 β exp(β1693/π)
TS = Tgas
πΎπ» =[Hrec]
[Htot]
M. Rutigliano, D. Santoro and M. Balat-Pichelin, Surface Science, 628, 66 (2014)
Electron-impact dissociation cross sections of vibrationally excited He2
+ molecular ion
πππ+ πΏππΊπ
+, π + π βΆ πππ+ π¨ππΊπ
+ + πβΆ ππ + ππ+ + π
R. Celiberto, K. Baluja, R. K. Janev and V. Laporta,Plasma Phys. Control. Fusion 58, 014024 (2015)