Notes
Slide Show
Outline
1
HD+ Photodissociation in an Ultrashort Infrared Laser Pulse:  Carrier-Envelope Phase Difference Effects
2
Motivation
    • Could any asymmetry be observed in HD+ photodissociation?


    • How to treat dissociation processes in the presence of ionization?


    • What kind of asymmetries might be expected?
3
Topics
    • 3D model (1 nuclear+2 electron degrees of freedom) of the HD+ ion in a laser field
    • Numerical solution of the time-dependent Schroedinger equation (TDSE)
    • The HD+ ion in the field of intense (4× to 9×1014W/cm2) 10fs  linearly polarized 790 nm laser pulse: calculation results
    • Carrier-envelope phase effects observability for reaction probabilities
    • Fragments' velocity distribution in scaled coordinate approach
    • Carrier-envelope phase effects observability for fragments' velocity distributions
4
 
5
Time-dependent Schroedinger equation
6
The time evolution
  • Operator splitting
7
Single and double-scale approximants
8
 
9
Channel separation: domains in the configuration space
  • Different channels can be identified by the corresponding domains in the configuration space
10
Electron density distribution
11
 
12
Laser phase averaged dissociation probabilities
13
Orientation averaged dissociation probabilities
14
The dissociation asymmetry observability
15
Scaled coordinates approach
16
 
17
Scaled coordinates distribution converges to momentum distribution
18
Fragment velocity distribution CEPD variation
19
Orientation averaged fragment velocity distribution CEPD variation
20
CEPD effects for the fragments of fixed velocity
21
Summary
  • Strong CEPD effects are expected for dissociation of the HD+ molecule in 10 fs 785 nm laser pulse
  • Reaction asymmetries can be observed only if the laser CEPD is controlled, charged and neutral reaction fragments must be registered separately
  • The effect is much stronger if fragment velocity selection is performed
22
Future
  • What are the velocity distributions for ionization?
  • How the initial state affects the results?
  • How to improve the accuracy/perfomance?