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Figure 1. Schematic diagram of molecular clock. The D2+ vibrational wave packet is probed by the correlated electron wave packet with attosecond time accuracy.
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Figure 2. Ionization of acetone triggered by intense femtosecond laser pulses. (a) Time-of-flight mass spectrum, (b) ion yield as a function of laser intensity, (c) electrostatic potential in laser field, and (d) ionization probability as a function of laser intensity. Reproduced with permission from Ref.[12], copyright 2001 American Chemical Society.
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Figure 3. Dissociation of methane triggered by intense femtosecond laser pulses. (a) Time-of-flight mass spectra at different laser field intensities, (b) schematic diagram of laser pulse simulation, (c) dressed potential energy surfaces along C–H bond of the CH4+ at different laser intensities in two opposite laser field directions, (d) quasi-classical trajectory of the averaged C–H distances of CH+, CH2+, and CH3+ ions at the laser field. Reproduced with permission from Ref.[13], copyright 2003 American Chemical Society.
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Figure 4. Experimentally measured momentum distributions of correlated atomic ions and kinetic energy release correlation diagram for two oxygen ions generated in the three-body fragmentation of CO23+. Reproduced with permission from Ref.[20], copyright 2013 the American Physical Society.
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Figure 5. Measured electron–nuclear joint energy spectrum of H2 +
$n\hbar\omega$ → H+ + H + e in linearly polarized femtosecond laser pulses. (a) Electron–nuclear joint energy spectrum. (b) Nuclear kinetic energy spectrum. (c) Photoelectron kinetic energy spectrum. Adapted from Ref.[22], copyright 2018 National Academy of Sciences. -
Figure 6. Alignment-dependent fluorescence emission induced by tunnel ionization of CO2 from lower-lying orbitals. (a) Energy level diagram of ionized and neutral CO2 molecules. (b) Typical fluorescence spectrum. (c) and (d) Calculated low-lying orbitals HOMO−1 and HOMO−2 of CO2. Reproduced with permission from Ref.[24], copyright 2013 the American Physical Society.
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Figure 7. The measured energy spectra of photoelectrons correlated with ionic fragments. Reproduced with permission from Ref.[26], copyright 2023 the American Physical Society.
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Figure 8. The asymmetric parameters as a function of CEP for three dissociative ionization channels of CO triggered by few-cycle laser pulses. Reproduced with permission from Ref.[27], copyright 2011 the American Physical Society.
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Figure 9. Schematic diagram illustrating the enhancement of N2+ lasing through efficient population transfer.
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