Radiative cooling of isolated Al₅^- cluster ions observed on ultralong timescales as a test case for the validity of the harmonic cascade model

Key Points

• This research aims to examine the vibrational radiative cooling process in isolated Al5- cluster ions to validate the harmonic cascade model.
• Utilized statistical models to analyze vibrational states and transition strengths
• Observed radiative cooling over ultralong timescales
• Tested the harmonic cascade model against empirical data
• Confirmed vibrational radiative cooling characteristics in Al5- cluster ions
• Supported the validity of the harmonic cascade model for describing this process
• Demonstrated significant correlations between calculated and observed transition strengths