IMPA I M P JUSTUS-LIEBIG- UNIVERSIT ÄÄT GIESSENJUSTUS-LIEBIG-IMPA UNIVERSIT ÄÄT GIESSEN I M P Research Coordination Meeting, IAEA CRP, Vienna, March 04-06, 2009. ... New York IAMP,

Experimental cross sections Experimental cross sections

for electronfor electron--impact ionization impact ionization

and and

l tl t i bi tii bi tielectronelectron--ion recombination ion recombination

Alfred MüllerAlfred MüllerInstitut für AtomInstitut für Atom-- und Molekülphysikund Molekülphysik

JUSTUS-LIEBIG-ÄI M PA UNIVERSITÄT

GIESSENI M PA

Research Coordination Meeting, IAEA CRP, Vienna, March 04-06, 2009

Experimental Experimental workwork withinwithin thethe CRP CRP was was performedperformed bybypp yy

Dietrich Bernhardt A. Wolf, Sebastian Böhm (now industry)Alexander Borovik jr.

M. Grieser, J. Hoffmann, A. S. Jaroshevich, C. Krantz, D. A. Orlov, R. Repnow, F. Sprengerj

Carsten Brandau (now GSI)Mohammad Gharaibeh

p , p g

MPI-K, Heidelberg

(visting from Irbid, Jordan)Pierre-Michel HillenbrandJoachim Rausch

D. W. Savin,M Lestinsky D Lukić M SchnellJoachim Rausch

Jan RudolphStefan SchippersEike Schmidt

M. Lestinsky, D. Lukić, M. Schnell

Columbia University, A t & A t h iEike Schmidt

A.M.

Astronomy & Astrophysics, New York

IAMP, Giessen

OutlineOutline

1. Overview of tasks to be performedp

2. Crossed-beams technique Ionization of Li+ ions: test of theory and experiment

3 Results on electron-impact ionization of ions3. Results on electron-impact ionization of ions Xeq+ , q = 1,…,22, + preliminary 23,24,25

4 M d b bi i4. Merged-beam recombination

5 Results on electron-ion recombination5. Results on electron-ion recombinationSi3+, Feq+, q = 7,…, 10, 13,…, 22

1. Overview of tasks to be performed1. Overview of tasks to be performedpp

GiessenGiessen workwork plannedplanned forfor thethe presentpresent CRPCRP

cross sections for electron-impact single and multiple ionization of ions

i llespeciallyXeq+ ions q=1,2,…,15and possibly also for Snq+ ions q=1 2and possibly also for Snq ions q 1,2,…

rate coefficients for radiative and dielectronic recombination

f iof ions especially Fe8+, Fe13+, Fe14+, Fe16+Fe , Fe , Fe , Fe

2. Crossed-beams techniqueIonization of Li+ ions: test of theory and experiment

ElectronElectron--ionioncrossedcrossed beamsbeamscrossedcrossed--beamsbeamssetupsetup atat IAMPIAMP

Versatile apparatus for studying atomicfor studying atomic collisions

ElectronElectron--ionion beam beam crossingcrossing regionregion

Measurement Measurement ofof absolute absolute crosscross sectionssections

Requirement for the measurement of cross sections:

Beam density distributions → beam overlap → formfactor

ElectronElectron--ionion beam beam crossingcrossing regionregion

Measurement Measurement ofof crosscross sectionssectionsabsolute high precisionabsolute high precision

Test Test experimentexperiment withwith LiLi++ (1s(1s22) ) ionsions A Borovik et al J Phys B 42 (2009) 025203

5

6Li+(1s2) present absolute

normalized scanpresent CCC

A. Borovik et al., J. Phys. B 42 (2009) 025203

4

5

18 c

m2 ) present CCC

Pindzola et al. 2000

3

4

on (

10-1

1

22

s se

ctio

0

1

1Cro

ss

70 80 90 100 110

200 400 600 800 10000

Electron energy ( eV )

Theory and experiment are in good agreement for this 2-electron system

EffectEffect ofof metastablemetastable LiLi++ (1s2s (1s2s 33S) S) admixtureadmixture in in thetheionion beam onbeam on measuredmeasured ionizationionization crosscross sectionssectionsionion beam on beam on measuredmeasured ionizationionization crosscross sectionssections

A. Borovik et al., J. Phys. B 42 (2009) 025203

8

18 c

m2 )

6

s 3 S

on (

10-

4 1s2s

ss s

ectio

2 present experiment absolute present overview scan present threshold scanen

t cro

s

1 S

0

present threshold scan present CCC 13% m.s. + 87 % g.s. Berengut et al. RMPS 13% m.s.A

ppar

e

1s2

100 1000


3. Results on electron-impact ionization of ionsXeq+ , q = 1,…,22, + preliminary 23,24,25, q , , , p y , ,

Xenon ions produced by ECR sourceXenon ions produced by ECR source 2003+++2++

50H2O

+OH+O+N2+C+

20 132131

129

40Xe8+

Xe7+

Xe6+

A)

10

15

136134

131

130+

CH+

30Xe9+

ent (

nA

1.92 1.93 1.94 1.95 1.96 1.97 1.98 1.990

5

136

128

20Xe10+

n C

urre

10 Xe12+

Xe11+ Io

0Xe14+ Xe13+

Xe

1.6 1.8 2.0 2.2 2.4 2.60

Analyzer Magnetic Field (kG)

ElectronElectron impactimpact singlesingle ionizationionization ofof XeXe+ + ionsions

3

Man et al (1987)

Single ionization of Xe+ (experimental data)

Man et al. (1987) Bell et al. (1993) Borovik et al. (2007)Borovik et al. (2007)m

2 )

2

Borovik et al. (2007) energy scan

( 10-1

6 cm

ctio

n (

1

Cro

ss s

e

Borovik et al unpublished data

0

C Borovik et al. unpublished data

100 10000


ElectronElectron impactimpact double double ionizationionization ofof XeXe+ + ionsions

[Kr]4d105s25p5 energy scan data

Xe+ + e → Xe3+ + 3e

40

50 [Kr]4d 5s 5p energy scan data absolute data

2 )

30

40

10-1

8 cm

20

30

ctio

n (

1

10

20

oss

sec

4d giant resonance

0

10

Cro

Borovik et al. unpublished data

100 1000


ElectronElectron impactimpact multiple multiple ionizationionization ofof XeXe+ + ionsions Borovik et al unpublished data

100


10m2 )

σ

1( 10-1

8 c σ1,2

0.1

σ1,3

sect

ion

0.01

σ1,4

Cro

ss

0.001σ1,6 σ1,8σ1,7

σ1,5[Kr]4d105s25p5

100 1000

,,


ElectronElectron impactimpact singlesingle ionizationionization ofof XeXe2+ 2+ ionsions2+ 3+

180

200 energy scan data

b l d[Kr]4d105s25p4

Xe2+ + e → Xe3+ + 2e

140

160

180 absolute data

m2 ) Borovik et al.

100

120

140

x10-1

8 cm

ground stateionization threshold

unpublished data

80

100

ctio

n ( x

40

60

ross

sec

0

20C

4d giant resonance

10 100 1000


ElectronElectron impactimpact ionizationionization ofof XeXe3+ 3+ ionsions

140 [Kr]4d105s25p3

Xe3+ + e → Xe4+ + 2e

energy scan data

120

140 [ ] d 5s 5p energy scan data absolute data

2 ) Borovik et al

80

100

10-1

8 cm

2 Borovik et al. unpublished data

60

80

ctio

n (

1

40

ross

sec

0

20Cr

4d giant resonance

100 1000


IonizationIonization ofof XeXe7+ 7+ ionsions byby electronselectrons andand photonsphotons

30

4d – nldipole

allowed

( Mb

) 20

7+ 8+

electron-impactexcitation-autoionization

allowed

ectio

n

0

10 e + Xe7+ → Xe8+ + 2e

Borovik et al. unpublished data1000

cros

s se 0

γ + Xe7+ → Xe8+ + e 4d – 5f

500

zatio

n c γ e → e e

photo-excitationautoionization Schippers et al., ICPEAC 2009

Abstract submitted

90 100 110 120 130 140 150 160 170 180

0Ioni Abstract submitted

90 100 110 120 130 140 150 160 170 180

Energy ( eV )

Single ionization of XeSingle ionization of Xeq+q+ ions: overviewions: overviewA B ik j M Gh ib h S S hi d A Müll 2007

Xe1+

Xe2+

A. Borovik jr., M. Gharaibeh, S. Schippers, and A. Müller, 2007

100 Xe3+

Xe4+

Xe5+b )

10

Xe Xe6+

Xe7+

X 8+on (

M

10 Xe8+

Xe9+

Xe10+

s se

ctio

1

Xe11+

Xe12+

Xe13+

Cro

ss

100 1000

Xe Xe14+

Xe15+unpublished data

100 1000


Xenon ions produced by ECR sourceXenon ions produced by ECR source 2007

25

O2+

2014+

C2+

O

15t ( n

A)

Xe16+

Xe15+ Xe14+

Xe13+

Xe17+

10

n C

urre

nt

Xe18+

19

N2+

5

Ion

Xe19+

Xe20+

0Xe22+

Xe

Xe21+

1350 1400 1450 1500 1550 1600 1650 1700 17500

Magnetic Field ( G )

ElectronElectron impactimpact ionizationionization ofof XeXeqq+ + ionsions, q=1,…,22, q=1,…,22Borovik et al. unpublished data

100

10 q =8 cm

2 ) 5

10

20

15

q 1 2 3 4on

( x1

0-1

1 5 6 7 8

9ss s

ectio

0.1

9 10 11 12

13

Cro

s

5

10

13 14 15 16 17

Charge

15

20

18 19 20 21

22

ge state

0 200 400 600 800 1000

22

Relative electron energy ( eV )

ElectronElectron impactimpact singlesingle ionizationionization ofof XeXe12+ 12+ ionsions


Giessen experiment

Pi d lPindzola group DW direct + EA


B ik t l bli h d d t1.5Theory Mandelbaum et al.:

direct ionization)Borovik et al. unpublished data

Giessen experiment1 0

direct ionization 3d-nl EA 3p-nl EAsummed cross section-1

8 cm

2

1.0 summed cross sectionPresent experiment:

absolute datan (

10-

Pi d l0.5

energy scan

sect

io

Pindzola group DW direct + EA

Cro

ss

600 700 800 900 1000

0.0

600 700 800 900 1000

Electron-ion collision energy ( eV )


Single ionization of Xe10+

A Müller Group6 A. Müller Groupmostly unpublished data

4

cm-2 )

10→

11 (

c

2 energy scan 2003 absolute data 2003 A=132 absolute data 2003 A=129 absolute measurement 2007absolute measurement 1992

σ

0

absolute measurement 1992 G. Hofmann et al., HCI VI, AIP Conf. Proc. 274 (1992) 485

100 1000

Electron-ion collision energy ( eV )

ElectronElectron impactimpact ionizationionization ofof XeXe24+ 24+ ionsions

X 24+ X 25+ 2

[Ar]3d104s2

Xe24+ + e → Xe25+ + 2e

1.4

cm2 )

g.s. ionization

( 10-1

8 c threshold

1.2

ectio

n

Borovik et al. preliminary

1.0

Cro

ss s

e

Strong resonance contributions

p yunpublished data

C

Unknown background (high Rydberg states?)

850 900 950 1000


4. Merged-beam recombination

ElectronElectron--ion collisions at heavyion collisions at heavy--ion storage ringsion storage ringsd ll l

from acceleratordipolequadrupole

Schottky

molecularfragmentimaging

induction

chargedfragmentcounting

beam profilemonitor

(hor./vert.)ion currentmonitor

ypick-up accelerator

septuminjectionand

extraction

Electron target sectionrecombination

extractedbeam

ion beamdirection

electron coolercollision product

detectors5m

ionizationionizationrecombination

Technique of merged beamsTechnique of merged beams

exploit extended interaction length and kinematic advantages

electronbeam

icharge-state

lion

beam( )

analyzer

Aq+

A(q-1)+

Storage ring TSR Storage ring TSR atat MaxMax--PlanckPlanck--Institut für Institut für Kernphysik, Heidelberg, Kernphysik, Heidelberg, wherewhere metastablesmetastables die out !?die out !?p y , g,p y , g,

5. Results on electron-ion recombinationSi3+, Feq+, q = 7,…, 10, 13,…, 22, , q , , , , ,

Dielectronic Dielectronic recombinarecombina--i f Fi f F

Fe17+ Fe18+

tion of Fe Ltion of Fe L--shell ions: shell ions: a jointa jointa jointa jointUSUS--German German project for project for p jp jastrophysicsastrophysics Fe19+ Fe20+

Columbia-Astrophysics Laboratory

Fe22+Fe21+

y

Justus-Liebig-Universität Fe22FeGiessen

Max-Planck-fInstitut für

Kernphysik

DielectronicDielectronic recombinationrecombination ofof FeFe16+16+

Fe16+ (2p6 1S0) + e → Fe15+ (2p5 3d 1P1 nl) → Fe15+ (2p6 3s) + photons

Dipole excitation of the ion core, high resonance energies

E. W. Schmidt et al., Proceedings of the Tokyo HCI Conference (2008)Proceedings of the Tokyo HCI Conference (2008)

Rate Rate coefficientcoefficient ofof dielectronicdielectronic recombinationrecombination ofof FeFe16+16+

E W Schmidt et al Proceedings of the Tokyo HCI Conference (2008)E. W. Schmidt et al., Proceedings of the Tokyo HCI Conference (2008)theory and experiment in agreement

Radiative recombination

Zatsarinny 2004Gu 2003

Dielectronic recombination

DielectronicDielectronic recombinationrecombination ofof FeFe15+15+

J. Linkemann et al., Nucl. Instrum. Meth. B 98, 154 (1995)

30 TSR experiment autostructure theory d7

l'

/2 ∞

3 /s )

3/2

∞

20 3s →

3d

4l'

s →

3p 1/

0-10 c

m3

3s →

3p 3

3s →

4l 3

ent

( 10 3

10

coef

ficie

0

Rat

e c

0 10 20 30 400


Rate Rate coefficientcoefficient ofof dielectronicdielectronic recombinationrecombination ofof FeFe15+15+

J Linkemann et al Nucl Instrum Meth B 98 154 (1994)J. Linkemann et al., Nucl. Instrum. Meth. B 98, 154 (1994)A. Müller, J. Mass. Spectrom. 192, 9 (1999)

RR Arnaud & Raymond DR Arnaud & Raymond experiment Linkemann et al.

RR

m3 /s

)

10-10

ent

( cm

11

DRexp

coef

fici

10-11

ma

rate

10-12

Plas

m

problem:low energy DR resonances

104 105 106 107 10810

Plasma temperature ( K )

RecombinationRecombination ofof FeFe7+ 7+ andand FeFe8+8+ ionsionsE W Schmidt et alE. W. Schmidt et al., A.& A. 492, 265 (2008)

Rate Rate coefficientscoefficients forfor recombinationrecombination ofof FeFe8+8+ ionsions

E. W. Schmidt et al., A.& A. 492, 265 (2008)

SummarySummary

Electron-impact ionization of ions:Cross sections for single and multiple ionization

of Xeq+ ions, q=1,…,22, ...,25and of Snq+ ions q=1 2 6and of Snq+ ions, q=1,2,…,6,…

are being measured in Giessen and analysis of the experimental results is underway. ((experimental results is underway. ((

Dielectronic recombination:resonance strengths and plasma rate coefficients are determined in high resolution storage ring experimentsdetermined in high-resolution storage ring experiments.Data for Fe7+ through Fe10+ and Fe13+ through Fe22+ have been obtained and most of them are published. Data onbeen obtained and most of them are published. Data on Si3+ have been published.

IMPA I M P JUSTUS-LIEBIG- UNIVERSIT ÄÄT GIESSENJUSTUS-LIEBIG-IMPA UNIVERSIT ÄÄT GIESSEN I M P Research Coordination Meeting, IAEA CRP, Vienna, March 04-06, 2009. ... New York IAMP,

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