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Advances In Multi-Photon Processes And Spectroscopy by S. Het Lin, S. Het Lin, A. A. Villaeys, Y. Fujimura

By S. Het Lin, S. Het Lin, A. A. Villaeys, Y. Fujimura

This publication offers the newest advancements and matters in either experimental and theoretical experiences of multi-photon procedures and the spectroscopy of atoms, ions and molecules in physics, chemistry, biology and fabric technological know-how. It includes evaluation papers compatible for either lively researchers and non-experts who desire to input the sector.

targeted cognizance is paid to the new growth of non-linear photon subject interactions in atoms, molecules and interfaces: XUV/soft X-ray, high-order harmonic iteration in attosecond regime, high-order harmonic iteration, sum frequency iteration, four-wave blending spectroscopy and molecular orientation with mixed electrostatic and excessive, non-resonant laser fields.

Contents: Nonlinear Optics for Characterizing XUV/Soft X-Ray High-Order Harmonic Fields in Attosecond Regime (Y Nabekawa & ok Midorikawa); Signatures of Molecular constitution and Dynamics in High-Order Harmonic new release (M Lein & C C Chiril ); Molecular Manipulation suggestions and Their purposes (H Sakai); Sum Frequency iteration: An creation with contemporary advancements and present matters (M J Shultz); Propagation and Intramolecular Coupling results in Four-Wave blending Spectroscopy (J L Paz); regulate of Molecular Chirality via Lasers (K Hoki & Y Fujimura).

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We have to consider what is and how it affects the temporal profile of the pulse train before determining it. The general expression of the intensity of the synthesized harmonic field, denoted I (t ), can be written from the absolute square of Eq. (8) as follows. I (t ) = I11 + I13 + I15 + 2 I11 I13 cos{2ωf (t + τg ) − + 2 I13 I15 cos{2ωf (t + τg ) + } } + 2 I15 I11 cos{4ωf (t + τg )}. (16) Here, we define τg ≡ (φ15 − φ11 )/(4ωf ). Obviously, the parameter τg is regarded as the group delay, which only induces a temporal shift of the pulse train, while the parameter changes the temporal profile.

Our main goal is the pulse measurement of the high-order harmonic fields based on the autocorrelation technique with nonlinear interaction. The first study shown in Sec. 3 is related to the twophoton double ionization (TPDI) of a helium atom interacting with the 27th harmonic pulse generated from the argon gas target, of which photon energy is 42 eV. The result of this experiment exhibited the first evidence of a nonlinear phenomenon in the soft X-ray region, and directly revealed the pulse shape of the 27th harmonic field in the sub-10 femtoseconds regime.

The integrated signals sent to the channel of the oscilloscope are recorded with statistical fluctuations, while the TOF spectra in another channel of the oscilloscope including the signal of doubly charged ion are averaged to 103 shots of the laser pulse for each measurement at the fixed intensity of the harmonic field. The intensity of the 27th harmonic pulse is adjusted by changing the energy of fundamental pulse. The result of this experiment is shown in Fig. 13. 00 4 3 3 He 2+ yield [arb. unit] 10 10 2 -3 9 8 2 3 3 4 + 5 6 7 8 9 1 He yield [arb.

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