Double-Core-Hole States in Neon: Lifetime, Post-Collision Interaction, and Spectral Assignment

Area of Science:

• Atomic Physics
• Quantum Mechanics
• Spectroscopy

Background:

• Understanding core-level electron behavior in atoms is crucial for atomic physics.
• Previous studies have explored electron shakeup and Auger decay, but detailed analysis of K^{-2}V states in neon is limited.

Purpose of the Study:

• To directly observe and identify photoelectrons from K^{-2}V states in neon.
• To experimentally determine natural lifetime broadening and shakeup channel intensities.
• To analyze high-energy Auger spectra and post-collision interaction broadening.

Main Methods:

• Utilized synchrotron radiation for high-resolution electron spectroscopy.
• Measured and assigned high-energy Auger spectra.
• Compared experimental results with ab initio calculations.

Main Results:

• Successfully observed and identified specific photoelectrons from K^{-2}V states in neon.
• Determined natural lifetime broadening and relative intensities of shakeup channels.
• Observed post-collision interaction broadening in the hypersatellite spectrum from K^{-2} states.

Conclusions:

• The study provides direct experimental evidence and detailed characterization of K^{-2}V states in neon.
• Experimental findings align with theoretical predictions, validating ab initio calculations.
• The research offers insights into complex electron correlation effects and atomic decay processes.