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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Molecules with deep vibrational potential wells provide optical intervalssensitive to variation in the proton-electron mass ratio ($\mu$). On one hand,polar molecules are of interest since optical state preparation techniques havebeen demonstrated for such species. On the other hand, it might be assumed thatpolar species are unfavorable candidates, because typical molecule-frame dipolemoments reduce vibrational state lifetimes and cause large polarizabilities andassociated Stark shifts. Here, we consider single-photon spectroscopy on avibrational overtone transition of the polar species TeH$^+$, which is ofpractical interest because its diagonal Franck-Condon factors should allowrapid state preparation by optical pumping. We point out that all but theground rotational state obtains a vanishing low-frequency scalar polarizabilityfrom coupling with adjacent rotational states, because of a fortuitousrelationship between rigid rotor spacings and dipole matrix elements. Weproject that for good choices of spectroscopy states, demonstrated levels offield control should make possible uncertainties of order $1 \times 10^{-18}$,similar to those of leading atomic ion clocks. The moderately long livedvibrational states of TeH$^+$ make possible a frequency uncertainty approaching$1 \times 10^{-17}$ with one day of averaging for a single trapped ion.Observation over one year could probe for variation of $\mu$ with a sensitivityapproaching the $1 \times 10^{-18}/\textrm{yr}$ level.

Prospects for Polar Molecular Ion Optical Probe of Varying Proton-Electron Mass Ratio