Ro-vibrational dynamics of N2O in superfluid 4He nano-droplets

TL;DR

This study explains the rotational and vibrational behaviors of N2O molecules in superfluid helium droplets using Macro-Orbital theory, aligning theoretical predictions with recent spectroscopic experimental results.

Contribution

It introduces a theoretical framework combining Macro-Orbital theory with cluster factors to accurately describe N2O dynamics in superfluid helium clusters, matching experimental observations.

Findings

Rotational spectrum shows sharp peaks similar to free molecules.

Monotonic decrease and oscillations in rotational constant B with cluster size.

Vibrational frequency shifts from blue to red as cluster size increases.

Abstract

In this paper we use the important interferences of Macro-Orbital theory of superfluidity clubbed with several factors that can change the rotational constant (B) and vibrational frequency of N2O in 4HeN-N2O clusters with N to account for the results of their recently reported spectroscopic studies which conclude that: (i) in spite of the fact that 4He atoms provide an interactive medium, the rotational spectrum of the clusters shows sharp peaks, similar to that of the molecule in gaseous state, indicating that the molecule rotates like a free rotor, (ii) B decreases monotonically from N = 1 to 6, remains nearly constant for N = 6 to 8 and increases for N = 9 to 10 with small oscillations there after and (iii) vibrational frequency exhibits blue shift for N = 1 to 5 and a red shift for higher N.