English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Cathodoluminescence VUV spectra of free pure nitrogen clusters produced bycondensation of gas mixtures in supersonic jets expanding into vacuum werestudied. The clusters were of icosahedral structure, as evidenced by ourelectron diffraction measurements, i.e., quasicrystals, and contained about1000 atoms. The cluster temperature was about 40 K. The luminescence spectrameasured in the range of 45,000-75,000 cm^-1 clearly showed three vibronic w ->X series of transitions from the excited 'w' to the ground 'X' state, which areintrinsic to nitrogen molecules. All the transitions revealed a strongdependence of the matrix shift of their peak positions on vibration quantumnumber, while for bulk samples of N2 the matrix shift is known to remainunchanged. Our analysis showed that in clusters the vibrational anharmonicityparameter changes drastically for both the upper and lower states, while thechange in the vibrational frequencies is much less prominent. The resultsobtained provide information about an abnormally strong influence of clusterenvironment on the nonlinear contribution to the vibrations of nitrogenmolecules.

Abnormally large changes in anharmonicity of intramolecular vibrations in free clusters of nitrogen