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1
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- I. Bocharova
- L. Cocke, I. Litvinyuk, A. Alnaser, C. Maharjan, D. Ray
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2
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- Motivation
- Coulomb explosion imaging.
- Experiment requirements.
- Experimental setup.
- H2 and D2
experiments.
- N2 and O2
experiments.
- C2H2
experiment.
- Future plans.
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3
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- To study the structure and its
time evolution of different gas molecules, using Coulomb explosion
imaging
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4
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5
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- Direct method which allows for
best time resolution : can use short pulses Þ Possible to observe molecules with fast dynamics
such as D2
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6
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- Laser impulse shorter than vibration period of molecule.
- High intensity to produce highly charged states, so explosion potential
can be approximated by Coulomb potential.
- Minimize the thickness of molecular target beam, so that interaction
volume is minimal.
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7
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8
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9
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10
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11
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- Diatomic molecule: double well potential.
- Picture is asymmetric in laser field.
- R0 is an interatomic distance for neutral molecule.
- Distance R between two centers increases.
- At some critical distance Rc enhanced ionization occurs.
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12
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|
|
13
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14
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15
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16
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17
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18
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19
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|
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20
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21
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- C2H2 experiment.
- Continue experiments with N2 and O2.
- CO2: triatomic molecule.
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22
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Notes