Experimental studies on photoabsorption by endohedral fullerene ions with a focus on Xe@C60+ confinement resonances

Müller, A.; Kilcoyne, A. L.D.; Schippers, S.; A Phaneuf, R.

doi:10.1088/1402-4896/abf069

Title: Experimental studies on photoabsorption by endohedral fullerene ions with a focus on Xe@C₆₀⁺ confinement resonances

Journal Article · Mon Apr 12 00:00:00 EDT 2021 · Physica Scripta

DOI:https://doi.org/10.1088/1402-4896/abf069· OSTI ID:1798796

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^[1]; A Phaneuf, R. ^[3]

Justus-Liebig Univ., Giessen (Germany)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of Nevada, Reno, NV (United States)

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@C₆₀⁺ molecular ion in which a xenon atom is centrally encapsulated inside a C$$^{+}_{60}$$ fullerene cage. Confinement resonances that result from the interference of Xe photoelectron matter waves emerging from the C$$^{+}_{60}$$ cavity were studied by exposing Xe@C₆₀⁺ ions to synchrotron radiation of 60 to 150 eV energy which is the region of the well-known giant atomic Xe 4d excitation resonance. Photoions Xe@C_n^q+ (with final charge states q = 2,3,4 of the product ions and numbers 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 (q = 2; n = 60, 58 and q = 4; n = 58, 56) 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.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: AC02-05CH11231; FG02-03ER15424

OSTI ID:: 1798796

Journal Information:: Physica Scripta, Vol. 96, Issue 6; ISSN 0031-8949

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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