Advances in Multi-Photon Processes and Spectroscopy: (Volume by S H Lin

By S H Lin

This quantity provides fresh development and views in multi-photon approaches and spectroscopy of atoms, ions, molecules and solids. the themes within the sequence disguise the experimental and theoretical investigations within the interdisciplinary examine fields of common technology together with chemistry, physics, bioscience and fabric technology.

This quantity is the most recent quantity in a sequence that could be a pioneer in compiling overview articles of nonlinear interactions of photons and subject. It has made a necessary contribution to the improvement and promoting of the similar study fields. In view of the speedy development in multi-photon tactics and multi-photon spectroscopy, care has been taken to make sure that the assessment articles inside the sequence are readable not just via lively researchers but in addition those people who are now not but specialists yet intend to go into the sphere.

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80 Theoretical efforts in understanding the tunneling process started with the development of quantum mechanics. A common feature of these theories is that the ionization rates depend strongly (exponentially) on the binding potential. Tunneling theory was first derived by Fowler and Nordheim81 in 1928, for the case of electron emission from metals. Oppenheimer82, 83 applied it to ionization of hydrogen-like atoms in strong external fields. It was later rederived by Keldysh78 and by Perelomov, Popov and Terentev,84 for DC tunneling from hydrogen-like atoms in a field of a strong oscillating electromagnetic field.

6 × 1012 W/cm2 respectively, with transform-limited pulse durations of 55 fs and 60 fs, respectively. The probe pulses have intensities of about 5 × 1013 W/cm2 with pulse durations of 60 fs. A clean oscillation at 112 ± 3 cm−1 is found in the UV pump data. It agrees with the calculated I–C–I bending frequency in the ionic ground state of the molecule (108 cm−1 ). , ∼ 114 cm−1 in Ref. 104). 02 eV below the energy of two UV photons. The modulation in + the CH2 I+ 2 ion yield as well as in the one of the CH2 I fragment is explained with further population transfer by the probe pulse from the nondissociative ionic ground state to V4 (see also Fig.

For the electronic-structure calculations (see also Sec. 1), we rely on three methods. DFT with the B3LYP functional92 and the aug-cc-pVTZ basis set extended with effective core potential93 for the iodine atom within the Gaussian03 program94 are used to optimize geometries and determine normal vibrational modes in ground electronic states. The most important coordinate in the considered systems is the I–C–Br or I–C–I bending coordinate, respectively, termed u as seen in Fig. 8. Consequently, the calculations are restricted to this one degree of freedom.

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