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Precision spectroscopy of HCI in a reaction microscope. C. Dimopoulou. Max-Planck-Institut für Kernphysik, Heidelberg. HITRAP Meeting, 26-28 May 2005, Munich. MPI-K Heidelberg @ HITRAP. Goal: study charge transfer processes in collisions between HCI and atoms/molecules/clusters.

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slide1

Precision spectroscopy of

HCI in a reaction microscope

C. Dimopoulou

Max-Planck-Institut für Kernphysik,

Heidelberg

HITRAP Meeting, 26-28 May 2005, Munich

slide2

MPI-K Heidelberg @ HITRAP

Goal: study charge transfer processes in collisions

between HCI and atoms/molecules/clusters

Task: develop a reaction microscope

(COLTRIMS spectrometer)

Milestone: tests of the reaction

microscope with light HCI

slide3

Extraction of HCI from the HD-EBIT

example: 3104 Kr30+ ions/s

count rate

magnetic field  sqrt(M/q), [arb.units]

ion beam size: ~5 mm (FWHM)

slide4

Target Jet

HCI Beam

Ion

Detector

Cold atomic/molecular

target

HCI beam

E~keV/u

position sensitive

detectors

E-field

recoil target

ions

E-field

Scattered

projectile

Projectile detector

Reaction Microscope

Coincident measurement of

momentum vectors of charged collision fragments

tests with hci from the ebit the electron capture experiment

He target

HCI beam

EBIT

Target Jet

HCI beam

PSD

E-field

Projectile

detector

Extraction of HCI

(e.g. Ne10+, Ar18+,

Kr34+, U64+,Xe54+)

recoil ions

E-field

recoil ion detector

PSD

t

  • TOF:
  • target ion charge
  • state
  • long. momentum

He+

  • Position:
  • trans. momentum

He2+

Tests with HCI from the EBIT: The electron capture experiment
tests with hci from the ebit the electron capture experiment1

He target

HCI beam

PSD

E-field

recoil ions

E-field

PSD

t

  • TOF:
  • target ion charge
  • state
  • long. momentum

He+

  • Position:
  • trans. momentum

He2+

Tests with HCI from the EBIT: The electron capture experiment
slide7

Ne6+

f

p

9 keV/q Ne7+

p

p

i

D

p

p

Q

p

vP = 0.36 a.u.

He+

Q ppi

p

^

r

p

r

=

-

p

= Q /

v

-

v

/2

p

r||

p

p

r

Electron capture: Precision spectroscopy

slide8

0,4

mrad

0,3

mrad

/

Q

0,2

scattering angle

Scattering angle /

0,1

HITRAP: ultimate Q-value resolution

pr|| Q /vp

0,0

10

20

30

40

50

60

70

Q

-

value /

eV

Q

-

value /

eV

capture into n=4

1500

1500

3

2s4s

S

1,3

1

2s 4

L

l

2s4p

P

x10

1000

1000

Projectile excitation

counts

2p 3

l

counts

counts

counts

3

2s4d

D

FWHM 0.72

eV

1

2s4d

D

1

500

2s4s

S

500

2s 3

l

0

0

10

20

30

40

50

60

70

15

16

17

18

19

20

21

22

23

24

25

Q

-

value /

eV

Q

-

value /

eV

Q value /

eV

Q value /

eV

Electron capture: Precision spectroscopy

  • excellent resolution: 0.7eV FWHM
  • excellent precision: 3-100 meV
  • many states resolved simultaneously
  • no selection rules
slide9

Q value (eV) :

Q = Ebf - Ebi

Single electron capture in

12 keV/q Ar16+-He collisions

cross section (arb.u.)

scattering angle (mrad)

Dynamics

cross section (arb.u.)

Structure

Q-value (eV)

slide11

First capture experiment with U64+ ions

Q value (eV) :

Q = Ebf - Ebi

14 keV/q U64+

(103-104 ions/s)

on He

cross section (arb.u.)

scattering angle (mrad)

Dynamics

cross section (arb.u.)

Structure

slide12

The HITRAP reaction microscope

Increased Acceptance for recoil ions:

large ion detector (MCP) with hole in preparation

summary outlook
Summary & Outlook

EBIT

Target: gas-jet

HCI beam

Projectile

detector

  • Reaction microscope:
  • ready and tested in EC
  • experiments with HCI
  • from the EBIT

recoil ion detector

  • Systematic study of EC for bare noble gas ions up to Xe54+ on He
  • Collaboration with S.Knoop, Groningen
  • Future:
  • Installation at HITRAP
slide14

Auger cascades

X-rays

E~keV/u

<~~~~~~~~~

Reaction

microscope

HCI

Target

Studies with HCI at HITRAP

HCI from HITRAP

Formation of ”hollow atoms”

t ≈ 1 fs

Questions:

  • Precision Spectroscopy
  • Dynamics of formation:
  • many-electron flux
  • 3. Rearrangement processes

 Coincident detection of ions, electrons and photons

slide15

People

Max-Planck Institut, Heidelberg

R. Moshammer, J. R. Crespo Lopez-Urrutia,

D. Fischer, C. Dimopoulou, T. Ferger, G. Sikler,

H. Tawara, A. Gonzalez, R. Soria,

G. Brenner, J. Braun, H. Bruhns, B. Feuerstein, J. Ullrich

Former collaborators

V. Mironov, C. Osborne, A. Lapierre, M. Trinczek

KVI, Groningen

S. Knoop, R. Hoekstra