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Strong-field ionization of water: Nuclear dynamics revealed by varying the pulse duration

Journal Article · · Physical Review A
 [1];  [2];  [3];  [1];  [4];  [4];  [5];  [2];  [1]
  1. Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States). Photon Ultrafast Laser Science and Engineering Inst. (PULSE)
  2. Stony Brook Univ., NY (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States). Photon Ultrafast Laser Science and Engineering Inst. (PULSE); Stanford Univ., CA (United States)
  4. Univ. of Mary Washington, Fredericksburg, VA (United States)
  5. National Research Council of Canada, Ottawa, ON (Canada); Univ. of Ottawa, Ottawa, ON (Canada)
+ Show Author Affiliations
Polyatomic molecules in strong laser fields can undergo substantial nuclear motion within tens of femtoseconds. Ion imaging methods based on dissociation or Coulomb explosion therefore have difficulty faithfully recording the geometry dependence of the field ionization that initiates the dissociation process. Here we compare the strong-field double ionization and subsequent dissociation of water (both H2O and D2O) in 10-fs and 40-fs 800-nm laser pulses. We find that 10-fs pulses turn off before substantial internuclear motion occurs, whereas rapid internuclear motion can take place during the double ionization process for 40-fs pulses. The short-pulse measurements are consistent with a simple tunnel ionization picture whose predictions help interpret the motion observed in the long-pulse measurements.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515; FG02-08ER15984
OSTI ID:
1788248
Journal Information:
Physical Review A, Journal Name: Physical Review A Journal Issue: 4 Vol. 103; ISSN 2469-9926
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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74 ATOMIC AND MOLECULAR PHYSICS