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Revisiting characteristic x-ray emission from hydrogen-like lead ions following radiative recombination
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DOI：10.1088/1402-4896/ae6737.png)
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Abstract
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Radiative recombination (RR) of free electrons with bare high-Z ions at near-threshold energies provides a sensitive probe of cascade dynamics in highly excited atomic systems. We present a combined experimental and time-dependent theoretical study of characteristic x-ray emission from hydrogen-like lead ions formed via RR at CRYRING@ESR. Using state- and angular-momentum-resolved cascade simulations up to n = 200, we demonstrate that the observed emission is dominated by Yrast-type decay chains proceeding along states with maximum orbital angular momentum (l = n - 1). These cascades account for approximately 90% of the total Lyman-alpha and Balmer-alpha radiation. The results provide a quantitative understanding of cascade feeding in heavy hydrogen-like ions and highlight the key role of high-angular-momentum Rydberg states in shaping recombination-driven x-ray spectra.
Keywords:
radiative recombination
hydrogen-like lead
Yrast-type decay chains
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