Angular Distributions and Polarization of Fluorescence in an XUV Pump–XUV Probe Scheme
This work provides theoretical calculations of fluorescence angular distribution and polarization within an XUV pump–XUV probe scheme designed for determining ultra-short lifetimes of highly charged heavy ions. The initial pumping leads to a non-zero alignment in the excited levels. After the probin...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-12-01
|
| Series: | Atoms |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2218-2004/13/1/1 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832589098307551232 |
|---|---|
| author | Cristian Iorga Viorica Stancalie |
| author_facet | Cristian Iorga Viorica Stancalie |
| author_sort | Cristian Iorga |
| collection | DOAJ |
| description | This work provides theoretical calculations of fluorescence angular distribution and polarization within an XUV pump–XUV probe scheme designed for determining ultra-short lifetimes of highly charged heavy ions. The initial pumping leads to a non-zero alignment in the excited levels. After the probing stage, the anisotropies in angular distribution and polarization of subsequent fluorescence are significantly enhanced due to the existence of a previous alignment. Furthermore, two-photon sequential excitation from a ground state with zero angular momentum to a level with angular momentum one by two aligned linearly polarized photon beams is strictly prohibited by the selection rules and may be used as a diagnostic tool to determine beam misalignment. The present approach is based on the density matrix and statistical tensor framework. We provide the analytical form for the alignment parameters caused by successive photoexcitation either with linearly polarized photon beams, or with unpolarized photons. The analytical results can generally be used to compute angular distribution asymmetry parameters and linear polarization of subsequent fluorescence for a large array of atomic systems used in pump–probe experiments. |
| format | Article |
| id | doaj-art-1676a5682d554c75b382ff6e35610e02 |
| institution | Kabale University |
| issn | 2218-2004 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Atoms |
| spelling | doaj-art-1676a5682d554c75b382ff6e35610e022025-01-24T13:22:04ZengMDPI AGAtoms2218-20042024-12-01131110.3390/atoms13010001Angular Distributions and Polarization of Fluorescence in an XUV Pump–XUV Probe SchemeCristian Iorga0Viorica Stancalie1National Institute for Laser, Plasma and Radiation Physics, Strada Atomistilor 409, 077125 Magurele, RomaniaNational Institute for Laser, Plasma and Radiation Physics, Strada Atomistilor 409, 077125 Magurele, RomaniaThis work provides theoretical calculations of fluorescence angular distribution and polarization within an XUV pump–XUV probe scheme designed for determining ultra-short lifetimes of highly charged heavy ions. The initial pumping leads to a non-zero alignment in the excited levels. After the probing stage, the anisotropies in angular distribution and polarization of subsequent fluorescence are significantly enhanced due to the existence of a previous alignment. Furthermore, two-photon sequential excitation from a ground state with zero angular momentum to a level with angular momentum one by two aligned linearly polarized photon beams is strictly prohibited by the selection rules and may be used as a diagnostic tool to determine beam misalignment. The present approach is based on the density matrix and statistical tensor framework. We provide the analytical form for the alignment parameters caused by successive photoexcitation either with linearly polarized photon beams, or with unpolarized photons. The analytical results can generally be used to compute angular distribution asymmetry parameters and linear polarization of subsequent fluorescence for a large array of atomic systems used in pump–probe experiments.https://www.mdpi.com/2218-2004/13/1/1density matrix formalismlinear polarization of fluorescenceasymmetry parameters |
| spellingShingle | Cristian Iorga Viorica Stancalie Angular Distributions and Polarization of Fluorescence in an XUV Pump–XUV Probe Scheme Atoms density matrix formalism linear polarization of fluorescence asymmetry parameters |
| title | Angular Distributions and Polarization of Fluorescence in an XUV Pump–XUV Probe Scheme |
| title_full | Angular Distributions and Polarization of Fluorescence in an XUV Pump–XUV Probe Scheme |
| title_fullStr | Angular Distributions and Polarization of Fluorescence in an XUV Pump–XUV Probe Scheme |
| title_full_unstemmed | Angular Distributions and Polarization of Fluorescence in an XUV Pump–XUV Probe Scheme |
| title_short | Angular Distributions and Polarization of Fluorescence in an XUV Pump–XUV Probe Scheme |
| title_sort | angular distributions and polarization of fluorescence in an xuv pump xuv probe scheme |
| topic | density matrix formalism linear polarization of fluorescence asymmetry parameters |
| url | https://www.mdpi.com/2218-2004/13/1/1 |
| work_keys_str_mv | AT cristianiorga angulardistributionsandpolarizationoffluorescenceinanxuvpumpxuvprobescheme AT vioricastancalie angulardistributionsandpolarizationoffluorescenceinanxuvpumpxuvprobescheme |