title: A systematic shift in the electronic spectra of substituted benzene molecules trapped in helium nanodroplets.
abstract: Electronic spectra (S1<--S0) have been recorded from five separate substituted benzene derivatives trapped in helium nanodroplets. Each member of the series is found to exhibit a blueshift with respect to the equivalent transition in the gas phase. Taken together with previous results for benzene, the observed shifts show a remarkably good correlation with changes in electron density that occur within each of the aromatic rings as a result of electronic excitation.
authors.affiliation: Department of Physical Chemistry, School of Chemistry, The University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom.
authors.forename: Adrian
authors.initials: A
authors.lastname: Boatwright
authors.forename: Nicholas A
authors.initials: NA
authors.lastname: Besley
authors.forename: Sharon
authors.initials: S
authors.lastname: Curtis
authors.forename: Rossana R
authors.initials: RR
authors.lastname: Wright
authors.forename: Anthony J
authors.initials: AJ
authors.lastname: Stace