Dramatic nondipole effects in low-energy photoionization: experimental and theoretical study of Xe 5s.
نویسندگان
چکیده
The Xe 5s nondipole photoelectron parameter gamma is obtained experimentally and theoretically from threshold to approximately 200 eV photon energy. Significant nondipole effects are seen even in the threshold region of this valence shell photoionization. In addition, contrary to previous understanding, clear evidence of interchannel coupling among quadrupole photoionization channels is found.
منابع مشابه
Theoretical and experimental demonstration of the existence of quadrupole Cooper Minima
Calculations and measurements of the Xe 5s and 5p nondipole photoelectron asymmetry parameters are obtained which present clear evidence of the existence of quadrupole Cooper minima, i.e., minima in quadrupole matrix elements as a function of energy, in the photoionization process. This verifies earlier predictions of quadrupole Cooper Minima. ‡ Present address: Laboratoire de Chimie Physique-M...
متن کاملStrong nondipole effects in low-energy photoionization of the 5s and 5p subshells of xenon
Large nondipole effects are predicted in the angular distribution of photoelectrons from the 5s and 5p subshells of xenon for photon energies below 200 eV. The nondipole parameter g5s exhibits a dispersion-curve variation near the first minimum of the 5s cross section at 35 eV, reaching a minimum value of 20.8 near 40 eV. Rapid variation of g5s is also found near the second minimum of the 5s cr...
متن کاملNondipole effects in Xe 4d photoemission
We measured the nondipole parameters for the spin-orbit doublets Xe 4d5/2 and Xe 4d3/2 over a photon-energy range from 100 eV to 250 eV at beamline 8.0.1.3 of the Advanced Light Source at the Lawrence Berkeley National Laboratory. Significant nondipole effects are found at relatively low energies as a result of Cooper minima in dipole channels and interchannel coupling in quadrupole channels. M...
متن کاملNondipole effects in the photoionization of xe 4d5/2 and 4d3/2: evidence for quadrupole satellites.
Measurements of nondipole parameters in spin-orbit-resolved Xe 4d photoionization demonstrate dynamical differences arising from relativistic effects. The experimental data do not agree with relativistic random-phase approximation calculations of single ionization dipole and quadrupole channels. It is suggested that the discrepancy is due to the omission of multiple-excitation quadrupole channe...
متن کاملLarge nondipole effects in the angular distributions of K-shell photoelectrons from molecular nitrogen.
Measurements of angular distributions of K-shell electrons photoejected from molecular nitrogen are reported which reveal large deviations at relatively low photon energies (Planck's omega < or = 500 eV) from emission patterns anticipated from the dipole approximation to interactions between radiation and matter. A concomitant theoretical analysis incorporating the effects of electromagnetic re...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Physical review letters
دوره 91 5 شماره
صفحات -
تاریخ انتشار 2003