کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5428850 | 1508691 | 2013 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Observation of even-parity autoionization states of uranium by three-colour photoionization optogalvanic spectroscopy in U-Ne hollow cathode discharges Observation of even-parity autoionization states of uranium by three-colour photoionization optogalvanic spectroscopy in U-Ne hollow cathode discharges](/preview/png/5428850.png)
Three-colour three-step photoionization spectroscopy of uranium has been performed in a U-Ne hollow cathode discharge tube by temporally resolving three-colour photoionization optogalvanic (PIOG) signal from the normal optogalvanic (OG) signal using three tunable pulsed dye lasers. U-Ne hollow cathode discharge tube has been used as a source of uranium atomic vapours and photoionization detector. Using this technique, photoionization spectra of uranium have been investigated systematically in the energy region 52,150-52,590Â cmâ1, through three different excitation pathways, originating from its ground state, 0Â cmâ1(5Lo6). By analysing the three-colour photoionization spectra sixty new even-parity autoionization resonances of uranium have been identified and their probable total angular momentum (J) values have been assigned according to the J-momentum selection rule. The J-value of five autoionization resonances, which have been observed either through all three excitation pathways or through two different excitation pathways where J-value of the second excited levels differs by two, has been assigned uniquely.
⺠Three-colour photoionization optogalvanic spectroscopy of uranium was performed in a U-Ne hollow cathode discharge tube. ⺠Hollow cathode discharge tube was used as a source of atomic vapour and laser ionisation detector. ⺠Uranium photoionization spectra were investigated through three different three-colour photoionization schemes. ⺠Sixty new even-parity autoionization levels of uranium were identified. ⺠J-value of five autoionization levels was assigned uniquely.
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 124, July 2013, Pages 79-85