The ultraviolet spectra of size-resolved (benzene)N, N=2–60

Photoabsorption spectra of benzene clusters BN containing up to N=60 molecules have been obtained on an N-resolved basis over the B2u region of the spectrum (λ=265–245 nm). The resonant enhanced two-photon ionization of a supercooled cluster beam yields distinctive spectra for each value of N. The energy of the 610 resonance is found to decrease monotonically with increasing N, but at N=50 is still far from condensed-phase values.