High-accuracy laser spectroscopy of <InlineEquation...

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High-accuracy laser spectroscopy of <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41586_2025_9306_Article_IEq1.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="27" /> </InlineMediaObject> <EquationSource Format="TEX">$${{\bf{H}}}_{{\bf{2}}}^{{\boldsymbol{+}}}$$</EquationSource> <EquationSource Format="MATHML"><math> <msubsup> <mrow> <mi mathvariant="bold">H</mi> </mrow> <mrow> <mn mathvariant="bold">2</mn> </mrow> <mrow> <mi mathvariant="bold">+</mi> </mrow> </msubsup> </math></EquationSource> </InlineEquation> and the protonelectron mass ratio

Nature, Published online: 06 August 2025; doi:10.1038/s41586-025-09306-2Doppler-free laser spectroscopy is used to measure with high precision a rovibrational transition frequency of trapped and cooled $${{\rm{H}}}_{2}^{+}$$ H 2 + ions.

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