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- W3136090108 abstract "Abstract A brief overview on the status of experimental investigations into photoionization and fragmentation of fullerenes and endohedral fullerenes by absorption of a single short-wavelength photon is presented. The focus of this paper is on the endohedral Xe@C 60 + molecular ion in which a xenon atom is centrally encapsulated inside a <?CDATA ${{rm{C}}}_{60}^{+}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msubsup> <mml:mrow> <mml:mi mathvariant=normal>C</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>60</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> </mml:mrow> </mml:msubsup> </mml:math> fullerene cage. Confinement resonances that result from the interference of Xe photoelectron matter waves emerging from the <?CDATA ${{rm{C}}}_{60}^{+}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msubsup> <mml:mrow> <mml:mi mathvariant=normal>C</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>60</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> </mml:mrow> </mml:msubsup> </mml:math> cavity were studied by exposing Xe@C 60 + ions to synchrotron radiation of 60 to 150 eV energy which is the region of the well-known giant atomic Xe <?CDATA $4d$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mn>4</mml:mn> <mml:mi>d</mml:mi> </mml:math> excitation resonance. Photoions Xe@C n q + (with final charge states <?CDATA $q=2,3,4$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>q</mml:mi> <mml:mo>=</mml:mo> <mml:mn>2</mml:mn> <mml:mo>,</mml:mo> <mml:mn>3</mml:mn> <mml:mo>,</mml:mo> <mml:mn>4</mml:mn> </mml:math> of the product ions and numbers <?CDATA $n=60,58,56,54$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>n</mml:mi> <mml:mo>=</mml:mo> <mml:mn>60</mml:mn> <mml:mo>,</mml:mo> <mml:mn>58</mml:mn> <mml:mo>,</mml:mo> <mml:mn>56</mml:mn> <mml:mo>,</mml:mo> <mml:mn>54</mml:mn> </mml:math> of carbon atoms left in the cage) were recorded as a function of photon energy and cross sections for the individual reaction channels were determined. In addition to previous work, new final channels ( <?CDATA $q=2;n=60,58$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>q</mml:mi> <mml:mo>=</mml:mo> <mml:mn>2</mml:mn> <mml:mo>;</mml:mo> <mml:mi>n</mml:mi> <mml:mo>=</mml:mo> <mml:mn>60</mml:mn> <mml:mo>,</mml:mo> <mml:mn>58</mml:mn> </mml:math> and <?CDATA $q=4;n=58,56$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>q</mml:mi> <mml:mo>=</mml:mo> <mml:mn>4</mml:mn> <mml:mo>;</mml:mo> <mml:mi>n</mml:mi> <mml:mo>=</mml:mo> <mml:mn>58</mml:mn> <mml:mo>,</mml:mo> <mml:mn>56</mml:mn> </mml:math> ) were observed, and thus, about 70% of the oscillator strength expected for the encapsulated Xe atom in the investigated energy range could be recovered. The present results establish the first and, so far, only conclusive experimental observation of confinement resonances in an endohedral fullerene. The data are in remarkable agreement with relativistic R-matrix calculations that accompanied the previous experimental work." @default.
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- W3136090108 date "2021-04-12" @default.
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- W3136090108 title "Experimental studies on photoabsorption by endohedral fullerene ions with a focus on Xe@C<sub>60</sub> <sup>+</sup> confinement resonances" @default.
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