Fragmentation, structure, and energetics of small sodium formate clusters: Evidence for strong influence of entropic effects

- Several NaOOCH clusters exhibit structures different from those of alkali halides.
- [NaOOCH]4Na+ behaves as an “anti-magic” cluster in the mass spectrometer.
- Dissociation energies cannot explain the abundances and fragmentation patterns.
- The relatively compact tetramer becomes unfavorable due to entropic effects.