Joaquim Maurício DUARTE-ALMEIDA, Ricardo José dos SANTOS, Maria Inês GENOVESE, Franco Maria LAJOLO
Franco Vecchiocattivi (University of Perugia) -...
14
Franco Vecchiocattivi (University of Perugia) Double photoionization of molecules by synchrotron radiation
Transcript of Franco Vecchiocattivi (University of Perugia) -...
Franco Vecchiocattivi(University of Perugia)
Double photoionization ofmolecules by synchrotronradiation
AB + hAB + hνν →→ ABAB2+2+ + 2 e + 2 e--
AA++ + B + B++
RR
AA++ + B + B++
A + BA + B2+2+
Coulombic repulsion:
Vrep(R) =
14.4
R(Å)eV____
effusive molecularbeam source
crossing withsynchrotronUV beam
electron MCPdetector
ionoptics
ion t.o.f.tube
ion positionsensitive detector
effusive molecularbeam source
crossing withsynchrotronUV beam
electron MCPdetector
ionoptics
ion t.o.f.tube
ion positionsensitive detector
ABC + hABC + hνν →→ [ABC] [ABC]2+2+ + 2 e + 2 e--
ABCABC2+2+
AB + CAB + C2+2+
AA++ + BC + BC++
AA++ CC2+2+BCBC++
ABCABC2+2+
tof
BCBC++
ABCABC2+2+
CC2+2+
AA++
NN22O + hO + hνν →→ [N [N22O]O]2+2+ + 2 e + 2 e--
NO+
N2+
N+
O+
(N(N22OO2+2+)*)*→→ NO NO++ + O + O++
NONO++ + N + N++
NN22++ + O + O++
M. Alagia, P. Candori, S. Falcinelli, M. Lavollée,M. Alagia, P. Candori, S. Falcinelli, M. Lavollée,F. Pirani, R. Richter, S. Stranges, F. VecchiocattiviF. Pirani, R. Richter, S. Stranges, F. VecchiocattiviChem. Phys. Lett. 432, 398 (2006).Chem. Phys. Lett. 432, 398 (2006).
NN22O + hO + hνν →→ [N [N22O]O]2+2+ + 2 e + 2 e--
(N(N22OO2+2+)*)*→→ NO NO++ + N + N++
NONO++ + N + N++
NN22++ + O + O++
N+
O+
(N(N22OO2+2+)*)*→→ NO NO++ + O + O++
NONO++ + N + N++
NN22++ + O + O++
M. Alagia, P. Candori, S. Falcinelli, M. Lavollée,M. Alagia, P. Candori, S. Falcinelli, M. Lavollée,F. Pirani, R. Richter, S. Stranges, F. VecchiocattiviF. Pirani, R. Richter, S. Stranges, F. VecchiocattiviChem. Phys. Lett. 432, 398 (2006).Chem. Phys. Lett. 432, 398 (2006).
N2O + hν → N+ + NO+
N2O + hν → N2+ + O+
vertical threshold vertical threshold for double for double photoionizationphotoionization
Threshold forThreshold for(N(N22OO2+2+)*)*→→ NO NO++ + O + O++
effusive molecularbeam source
crossing withsynchrotronUV beam
electron MCPdetector
ionoptics
ion t.o.f.tube
ion positionsensitive detector
UV light polarization directionUV light polarization direction
ABC + hABC + hνν →→ A A++ + BC + BC++ + 2 e + 2 e--
AA++BCBC++
O+N2+
NO+ N+
NN22O + hO + hνν →→ N N++ + NO + NO++ + 2e + 2e--
39 eV39 eV
NN22O + hO + hνν →→ N N22++ + O + O++ + 2e- + 2e-
39 eV39 eV
M. Alagia, P. Candori, S. Falcinelli, M. Lavollée, F. Pirani, R. Richter, S. Stranges, F. Vecchiocattivi,M. Alagia, P. Candori, S. Falcinelli, M. Lavollée, F. Pirani, R. Richter, S. Stranges, F. Vecchiocattivi,J. Chem. Phys. 126, 201101 (2007)J. Chem. Phys. 126, 201101 (2007)..
M. Alagia, P. Candori, S. Falcinelli, M. Lavollèe, F. Pirani, R. Richter, S. Stranges, F. Vecchiocattivi,J. Phys. Chem. A 113, 14755, (2009)
M. Alagia, P. Candori, S. Falcinelli, M. Lavollée, F. Pirani, R. Richter, S. Stranges and F. Vecchiocattivi,Phys. Chem. Chem. Phys. 12, 5389 (2010).
Double photoionization of benzene
threshold energy
24.65 ± 0.03 eV
27.8 ± 0.1 eV
29.5 ± 0.1 eV
30.2 ± 0.1 eV
C6H6 + hν → C6H62+ + 2 e-
→ C5H3+ + CH3
+
→ C4H3+ + C2H3
+
→ C4H4+ + C2H2
+
→ C3H3+ + C3H3
+ ?
C6H6 + hν → C6H62+ + 2 e-
→ C5H3+ + CH3
+
→ C4H3+ + C2H3
+
→ C4H4+ + C2H2
+
CH2=C=C=CH2+ + CHCH+
C=C=CH2 + CH3+
HC |HC
+
+ CH2CH+HC—C | | HC—CH
+
B. BrunettiB. BrunettiP. CandoriP. CandoriS. FalcinelliS. FalcinelliM. S. Pedrosa MundimF. PiraniF. PiraniM. RosiM. Rosi
UniversitUniversitàà di Perugia di Perugia
M. AlagiaM. AlagiaR. RichterR. Richter
Sincrotrone TriesteSincrotrone Trieste
S. StrangesS. Stranges
UniversitUniversitàà di Roma di Roma““La SapienzaLa Sapienza””
UniversitUniversitéé Paris-Sud Paris-Sud
M. LavollM. Lavollééee
