Magneto-optical measurements of the negatively charged <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>2</mml:mn><mml:mi>s</mml:mi></mml:mrow></mml:math> exciton in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>WSe</mml:mi><mml:mn>2</mml:mn><mml:none /></mml:mmultiscripts></mml:math>

Monolayer transition metal dichalcogenides (TMDs) host a variety of optically excited quasiparticle species that stem from two-dimensional confinement combined with relatively large carrier effective masses and reduced dielectric screening. The magnetic response these quasiparticles gives information on their spin valley configurations, nuanced interactions, insight into the underlying band structure. Recently, there have been several reports $2s/3s$ charged excitons in TMDs, but very little is still known about to external fields. Using photoluminescence excitation spectroscopy, we observe presence $2s$ exciton report its an applied field. We benchmark this against neutral find both exhibit similar behavior $g$ factors ${g}_{{X}_{0}^{2s}}=\ensuremath{-}5.20\ifmmode\pm\else\textpm\fi{}0.11$ ${g}_{{X}_{\ensuremath{-}}^{2s}}=\ensuremath{-}4.98\ifmmode\pm\else\textpm\fi{}0.11$, respectively.