By I. Lindgren, J. Morrison
This e-book has built via a chain of lectures on atomic conception given those final 8 years at Chalmers collage of expertise and a number of other oth er examine facilities. those classes have been meant to make the fundamental parts of atomic idea to be had to experimentalists operating with the hyperfine constitution and the optical homes of atoms and to supply a few perception into contemporary advancements within the thought. the unique purpose of this booklet has progressively prolonged to incorporate quite a lot of subject matters. we've got attempted to supply a whole description of atomic concept, bridging the distance among introductory books on quantum mechanics - equivalent to the e-book via Merzbacher, for example - and current day learn within the box. Our presentation is restricted to static atomic prop erties, comparable to the potent electron-electron interplay, however the formalism may be prolonged with no significant problems to incorporate dynamic houses, similar to transition possibilities and dynamic polarizabilities.
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Additional info for Atomic Many-Body Theory (Springer Series in Chemical Physics)
The temporal resolution, limited by the chirp of the white light probe, is usually around 100 fs; such resolution may not be sufficient for the time domain observation of many high-frequency vibrations. 20 Scheme of the two-color pump-probe system based on NOPAs. BS, beam splitters; AF, attenuating filter; M1, M2, metal mirrors; MC, monochromator; PD, photodetector; SHG, second-harmonic generation crystal for auto-/cross-correlation. 20 shows the schematic of a two-color pump-probe system based on NOPAs, providing sub-20-fs temporal resolution [98, 106] over a broad spectral range.
Furthermore, the differences in group velocities of the interacting pulses are much larger in the visible range, preventing the use of long nonlinear crystals. This disadvantage is partially compensated for by the larger gain for parametric interaction in the visible. Also in visible OPAs the most popular nonlinear material is BBO. Type II phase matching provides gain bandwidths that are narrower and stay essentially constant over the tuning range, which may be beneficial for some spectroscopic applications .
The beams are combined noncollinearly in a nonlinear crystal for frequency up-conversion; the chirp introduced by the glass block is sufficiently high to ensure that each pulse replica is up-converted by a quasi-CW (continuous wave) field. The sum frequency is detected by a high spectral resolution spectrometer, yielding the spectral interferogram corresponding to Eq. 28). The time delay τ is determined by measuring the interferogram of the SH of the two pulse replicas generated by the Michelson interferometer.