by Coincidence Techniques H. Farrokhpour, M. Ghandehari, E. - - PowerPoint PPT Presentation

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by Coincidence Techniques H. Farrokhpour, M. Ghandehari, E. - - PowerPoint PPT Presentation

Aug 25, 2022 234 likes •546 views

Study of Argon Dimer Core Ionization by Coincidence Techniques H. Farrokhpour, M. Ghandehari, E. Keshavarz, A. Kivimaki, Z. Noorisafa, R. Richter, H. Sabzyan, M. Tozihi 7 th ILSF users meeting,

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SLIDE 1

Study of Argon Dimer Core Ionization by Coincidence Techniques

7th ILSF users’ meeting, Qazvin, April 2015

  • H. Farrokhpour, M. Ghandehari, E. Keshavarz, A. Kivimaki,
  • Z. Noorisafa, R. Richter, H. Sabzyan, M. Tozihi

ميحرلا نمحرلا للوللوا مسب

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SLIDE 2
  • Core electron excitation/ionization and relaxation channels

(Auger, RCT, ICD, ETMD)

  • Fragmentation process monitoring by coincidence techniques

(PEPECO, TPEsCO, PEPICO, PIPICO, PEPIPICO, FPICO, FPIPICO)

Introduction

2

 Van derWaals interactions in inert gas clusters

hν

Auger Auger RCT ICD

  • 1. Cederbaum, et al. PRL, 1997, 79, 4778. 2. Kreidi, et al. PRA, 2008, 78, 043422.
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SLIDE 3

Experimental method

3

 Elettra GasPhase beamline (13.5-900 eV)

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SLIDE 4

Experimental setup-1

4

 PhotoElectron-PhotoIon-PhotoIon Coincidence spectroscopy (PEPIPICO)

hν

hν = 255− 340eV, ΔE/E ~ 30meV t ~ −56°C

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SLIDE 5

Results-1

5

 Time-of-flight spectrum

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SLIDE 6

Results-1

6

 Mass spectrum

 2

Ar

 3

Ar

 4

Ar

Ar

 2

Ar

Ar

Conditions optimization

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SLIDE 7

Results-1

7

 Coincidence spectrum

  

  Ar Ar Ar2

2   

 

2 3 2

Ar Ar Ar

  

 

3 4 2

Ar Ar Ar

  

 

2 2 4 2

Ar Ar Ar

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SLIDE 8

Results-1

8

 Photon energies

Ionization product Photon energy (eV)

2p−1

3/2,1/2

248.628, 250.776 2p−1 3p−1 4p ~ 270−275 2s−14p 323.6 2s−1 326.26

255 eV 274 eV 325 eV 330 & 340 eV

  • 1. King, et al. J. Phys. B 1977 10, 2479.
  • 2. Avaldi, et al. J. Phys. B 1994 27,3953.
  • 3. Sankari, et al. Phys. Rev. A 2002 65,042702.
  • 4. Glans, et al. Phys. Rev. A 1993 47,1539.
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SLIDE 9

Results-1

9

 Channels intensity

Ar+ + Ar+ Ar2+ + Ar+ Ar3+ + Ar+ Ar2+ + Ar2+

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SLIDE 10

Results-1

10

 Relaxation channels (255 eV)

Auger decay Auger decay double Auger decay double Auger decay

Ar+(2p-1)Ar Ar2+(3p-2)Ar Ar+(3p-1)Ar+(3p-1) Ar2+(3s-13p-1+3p-33d)Ar Ar2+(3p-2)Ar+(3p-1)

RCT ICD

Ar3+(3s-13p-2)Ar Ar3+(3p-3)Ar

RCT Ar2+(3p-2)Ar+(3p-1) ETMD

Ar2+(3p-2)Ar2+(3p-2) Ar3+(3s-23p-1)Ar Ar3+(3p-3)Ar+(3p-1)

ICD double Auger decay

hν

ICD RCT

  • 1. Saito, et al. Chem. Phys. Lett. 2007, 441, 16. 2. Bruken, et al. PRA 2002, 65, 042708.
  • 3. Stoychev, et al. J. Chem. Phys. 2008, 128, 14307. 4. Nakano, et al. PRA 2012, 85, 043405.
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SLIDE 11

Results-1

11

 Relaxation channels (330 & 340 eV)

Auger decay Auger decay Auger decay double Auger decay

Ar+(2s-1)Ar Coster-Kronig Ar2+(2p-1(3s,3p)-1)Ar Ar3+(3p-3)Ar RCT Ar2+(3p-2)Ar+(3p-1) Ar3+(3s-13p-2)Ar

ETMD Ar2+(3p-2)Ar2+(3p-2)

Ar3+(3s-23p-1)Ar Ar3+(3p-3)Ar+(3p-1)

ICD

Ar4+(3s-13p-3)Ar Ar4+(3p-4)Ar

RCT Ar3+(3p-3)Ar+(3p-1)

Ar4+(3p-4)Ar+(3p-1)

ICD

Ar3+(3p-3)Ar2+(3p-2)

ETMD Auger decay

Ar3+(2p-13p-2)Ar

double Auger decay

  • 1. Kylli, et al. PRA 1999, 59, 4071. 2. Lablanquie, et al. PRL 2000, 84, 47.
  • 3. Bruken, et al. PRA 2002, 65, 042708 . 4. Sakai, et al. PRL 2011, 106, 033401.
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SLIDE 12

T2

max intensity half max intensity

Results-1

12

 Kinetic energy release estimation

qE m v t

max

2  

t  2

t

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SLIDE 13

Results-1

13

 Kinetic energy release estimation

Spectrum est. of KER Coulomb est. of KER

Ar+ + Ar+ 4.5 eV 3.8 eV Ar2+ + Ar+ 6.0 eV 7.6 eV Ar3+ + Ar+ 7.8 eV 11.0 eV

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SLIDE 14
  • Phys. Rev. A 89, 053409 (2014)

14

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SLIDE 15

15

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SLIDE 16

Experimental setup-2

16

 Flourescence-PhotoIon-PhotoIon Coincidence spectroscopy (FPIPICO)

+2.4 kV

monitoring RCT process

  • 300 V
  • 200 V

hν

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SLIDE 17

Results-2

17

 Coincidence spectrum (~249 eV)

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SLIDE 18

Experimental setup-3

18

 fast ion- fast ion coincidence spectroscopy

  • 2.3 kV

+15 V

  • 1.5 V
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SLIDE 19

Results-3

19

 Coincidence (TOF) spectrum

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SLIDE 20

Results-3

20

 Energy scan spectra

monomer spect. dimer spect. s 4 p 2

3/2 

s 4 p 2 1/2  3d p 2

3/2 

4d p 2

3/2 

5d p 2

3/2 

3d p 2 1/2  d 4 p 2 1/2  d 5 p 2 1/2 

Avaldi, et al. J. Phys. B 1994 27,3953.

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SLIDE 21

21

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SLIDE 22

Acknowledgment

22

 Prof. Robert Richter  Dr. Hossein Farrokhpour  Prof. Hassan Sabzyan  Prof. Antti Kivimaki  Dr. Zeinab Nourisafa  Dr. ManijehTozihi  Maryam Ghandehari

 Abdus Salam International Center for Theoretical Physics (ICTP)  University of Isfahan

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SLIDE 23

23

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SLIDE 24

24

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SLIDE 25

25

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SLIDE 26

26

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SLIDE 27

27

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SLIDE 28

28

 Relaxation channels (274 eV)

Ar+(2p-13p-1np)Ar Auger decay

Auger decay double Auger decay double Auger decay

Ar2+(3p-2)Ar Ar+(3p-1)Ar+(3p-1)

RCT

Ar3+(3p-3)Ar

RCT

Ar2+(3p-2)Ar+(3p-1) Ar3+(3s-13p-2)Ar Ar2+(3p-3np)Ar

autoionization

Ar3+(3p-3)Ar Ar2+(3s-13p-1+3p-33d)Ar Ar2+(3p-2)Ar+(3p-1)

ICD Auger decay RCT Auger decay

Ar2+(3s-13p-2np)Ar

Auger decay ETMD Ar2+(3p-2)Ar2+(3p-2)

Ar3+(3s-23p-1)Ar Ar3+(3p-3)Ar+(3p-1)

ICD double Auger decay

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SLIDE 29

29

 Relaxation channels (325 eV)

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SLIDE 30

Ne 2s ionization

30

photons electrons