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

Abstract

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.

Formation of Large Molecular Cluster Anions and Elucidation of Their Electronic Structures

“…Some previous studies have already addressed this subject. Representative examples are the spectroscopic works conducted around 1990: the electronic spectroscopy of (benzene) n (n 60) 23,24 and (H 2 O) n À (n ¼ 6-50), 25 and the photoelectron spectroscopy of (H 2 O) n À (n ¼ 2-69), 26,27 (NH 3 ) n À (n ¼ 41-1100), 27,28 X À (H 2 O) n (n ¼ 1-60), 29,30 and X À (CH 3 CN) n (n ¼ 1-55; X = Cl, Br, and I). 31 In recent years, many beautiful experimental results have been reported for large hydrated clusters, such as SO 4 2À -(H 2 O) n (n ¼ 4-40), 32 H þ (H 2 O) n (n 27), [33][34][35] and (H 2 O) n À (n 200), [36][37][38][39] using the coupling of the state-ofthe-art molecular beam sources and optical methods with mass spectrometry.…”