تقرير
Unified ab initio treatment of attosecond photoionization and Compton scattering
| العنوان: | Unified ab initio treatment of attosecond photoionization and Compton scattering |
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| المؤلفون: | Yudin, G. L., Bondar, D. I., Patchkovskii, S., Corkum, P. B., Bandrauk, A. D. |
| المصدر: | J. Phys. B 42, 205601 (2009) |
| سنة النشر: | 2008 |
| المجموعة: | Physics (Other) |
| مصطلحات موضوعية: | Physics - Atomic Physics, Physics - Optics |
| الوصف: | We present a new theoretical approach to attosecond laser-assisted photo- and Compton ionization. Attosecond x-ray absorption and scattering are described by $\hat{\mathrsfs{S}}^{(1,2)}$-matrices, which are coherent superpositions of "monochromatic" $\hat{S}^{(1,2)}$-matrices in a laser-modified Furry representation. Besides refining the existing theory of the soft x-ray photoelectron attosecond streak camera and spectral phase interferometry (ASC and ASPI), we formulate a theory of hard x-ray photoelectron and Compton ASC and ASPI. The resulting scheme has a simple structure and leads to closed-form expressions for ionization amplitudes. We investigate Compton electron interference in the separable Coulomb-Volkov continuum with both Coulomb and laser fields treated non-perturbatively. We find that at laser-field intensities below 10$^{13}$ Wcm$^{-2}$ normalized Compton lines almost coincide with the lines obtained in the laser-free regime. At higher intensities, attosecond interferences survive integration over electron momenta, and feature prominently in the Compton lines themselves. We define a regime where the electron ground-state density can be measured with controllable accuracy in an attosecond time interval. The new theory provides a firm basis for extracting photo- and Compton electron phases and atomic and molecular wavefunctions from experimental data. Comment: 15 pages, 5 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1088/0953-4075/42/20/205601 |
| URL الوصول: | http://arxiv.org/abs/0810.2322 |
| رقم الأكسشن: | edsarx.0810.2322 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1088/0953-4075/42/20/205601 |
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