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

High-resolution coherent Raman spectroscopic measurements of all threetritium-containing molecular hydrogen isotopologues T$_2$, DT and HT wereperformed to determine the ground electronic state fundamental Q-branch ($v=0\rightarrow 1, \Delta J = 0$) transition frequencies at accuracies of $0.0005$cm$^{-1}$. An over hundred-fold improvement in accuracy over previousexperiments allows the comparison with the latest ab initio calculations in theframework of Non-Adiabatic Perturbation Theory including nonrelativisitic,relativisitic and QED contributions. Excellent agreement is found betweenexperiment and theory, thus providing a verification of the validity of theNAPT-framework for these tritiated species. While the transition frequencieswere corrected for ac-Stark shifts, the contributions of non-resonantbackground as well as quantum interference effects between resonant features inthe nonlinear spectroscopy were quantitatively investigated, also leading tocorrections to the transition frequencies. Methods of saturated CARS with theobservation of Lamb dips, as well as the use of continuous-wave radiation forthe Stokes frequency were explored, that might pave the way for futurehigher-accuracy CARS measurements.

Precision measurement of the fundamental vibrational frequencies of tritium-bearing hydrogen molecules: T$_2$, DT, HT