Electron dynamics and molecular Coulomb explosion: critical radius vs dynamic screening

Kun Zhao, III Hill (University of Maryland)

Session H4. Intense-Field Atomic Dynamics.

Thursday afternoon, 13:30, Auditorium, JILA

1.5 2.0 2.5 3.0 3.5

TIME (s)

C3+

O 3+

C2+

O 2+

C+

CO 22+

O +

O +/O 22+

H2O +

PERPENDICULAR

PARALLEL

3-Atom Coulomb Explosion TOF Analysis Inadequate

Momentum Image

0

0

Momentum

Mom

entu

m

Scale: 5 – 8 amu/div

POLARIZATION

AXIS

Time-Resolved Waveforms

Digital Scope AcquisitionMass-Resolved

Energies Distributions

Time-Resolved Images128 x 128 Pixels

730 Hz Digital Acquisition500,000 – 1,000,000 Frames

Mass-ResolvedEnergies & Angular Distributions

2.6 2.8 3 3.2 3.4Time HusL0

0.0005

0.001

0.0015

0.002

ed

ut

il

pm

A

CO2 : Parallel HSolidLvs Perpendicular HDashedL

20 qVrE

Momentum & Time-of-Flight Spectra

qmtfE ,;0 qVrp 0

Ar+ PumpN

d:Y

LF P

um

p

Mode LockedTi:Sapphire

Ti:SapphireRegen

BeamDiagnostics

TimingElectronics

ComputerW/ Frame Grabber

DigitalScope

Image Spectromet

er

2.6 2.8 3 3.2 3.4Time HusL0

0.0005

0.001

0.0015

0.002

ed

ut

il

pm

A

CO2 : Parallel HSolidLvs Perpendicular HDashedL

1 mJ, 800 nm, 100 fs @ 1 KHz

6(k) O+

720 – 820 ns(l) O+

770 – 870 ns(m) OH+

820 – 920 ns(n) N2+,3+ , O2+,3+

320 – 620 ns(o) All Ions

All Time

(f) N2+ , O2+

470 – 570 ns(g) O2+

520 – 620 ns(h)

570 – 670 ns(i) N+

620 – 720 ns(j) N+

670 – 770 ns

(a) H+

110 – 210 ns(b) H2

+

210 – 310 ns(c) N3+

320 – 420 ns(d) N3+ , O3+

370 – 470 ns(e) N2+

420 – 520 ns

10

CORRELATION IMAGEAVERAGE IMAGE

SELECTIVE AVERAGE

POLARIZATIONAXIS

REAL SPACE CORRELATION IMAGES

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Correlation Imaging

AVERAGE IMAGE SELECTIVE AVERAGE

POLARIZATIONAXIS

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