Dominance of angular momentum exchange in the PCI recapture of photoelectrons revealed by high resolution Auger electron measurements of Kr

Abstract

An unexpectedly prominent angular momentum exchange effect in the double photoionization continuum was identified through the photoelectron recapture process induced by post-collision interaction (PCI). The Kr (M5N2,3N2,3) Auger electron spectrum originating from 3d−15/2 photoionization was measured with the photon energy tuned very close above the ionization threshold. As the photon energy approached the 3d−15/2 photoionization threshold, Rydberg series structures including several angular momentum components were formed within the Auger peak profile by the recapture of the photoelectrons into high-lying final ion orbitals. Our spectrum with line-width much narrower than the lifetime width of the corresponding core excited state allowed us to resolve detailed structures due to the orbital angular momentum states very clearly. Unexpectedly, conjugate peaks originating from the exchange of angular momentum between the photoelectron and the Auger electron through PCI were found to dominate the spectrum. Comparison with valence photoelectron spectrum of Kr via direct photoionization confirms the new assignment. Conjugate peaks were also found to be in accord with the quantum defect values obtained for the high Rydberg series Kr+4p−2(1S0, 1D2)ml. Extension of the new assignments to photon energies below threshold may call for the revision of previous interpretations of resonance Auger processes.

Conjugate photoelectron recapture peaks in the high resolution Auger electron spectra following near-threshold Ar 2p photoionization

“…For the low principal quantum number peaks the ms, (m−1)d, (m−1)f peaks associated with the main mp peaks were observed. This observation, similar to the cases of Kr M 45 N 23 N 23 [1]. Auger electron spectrum is particularly interesting in that the dipole forbidden mp appears as the strongest component in comparison to the dipole allowed (m−1)d, ms components, in a manner quite similar to the recently obtained Kr result [1].…”

“…This paper is sequel to the recent work on the dominance of angular momentum exchange in the post-collision interaction (PCI) recapture of photoelectrons revealed by high resolution Auger electron measurements of Kr [1]. In photoionization 6 Author to whom any correspondence should be addressed.…”

“…In such cases, the discrete Rydberg series structures get imprinted on the Auger electron peak pro le. In fact, such Rydberg structures due to photoelectron recapture have been observed in the Auger spectrum upon the near-threshold photoionization of Ne 1s [23,24], Ar 1s [25], Kr 2p [26], Kr 3d [1,27], Xe 4d [27,28]. Some studies have examined the recapture probabilities depending on the principal quantum number of the Rydberg orbital [23][24][25].…”

“…Nevertheless, few studies in the past have discussed the angular momentum states of those Rydberg levels. Only recently, a high resolution measurement resolving angular momentum states of the Rydberg series was made for Kr 3d near threshold photoionization [1]. Analysis of this spectrum resulted in a highly unexpected assignment of the peaks representing recapture into dipole forbidden md orbitals.…”

Application of Early Multi-dimensional Cardiac Rehabilitation Nursing in Percutaneous Coronary Intervention and Its Effects on Adverse Events and Patients’ Adherence to Medication

“…These include such issues as a high incidence of cardiovascular adverse events and poor patient adherence to medication. Therefore, effective nursing interventions are very important in patients undergoing PCI [6][7][8] . With the improvement of living standards, patients have more stringent requirements for perioperative nursing when undergoing PCI.…”