Oscillation in Excited State Lifetimes with Size of Sub-nanometer Neutral (TiO 2 ) n Clusters Observed with Ultrafast Pump–Probe Spectroscopy
Source abstract
Abstract
Neutral titanium oxide clusters of up to 1 nm in diameter (TiO 2 ) n, with n < 10, are produced in a laser vaporization source and subsequently ionized by a sequence of femtosecond laser pulses. Using a 400 nm pump and 800 nm probe lasers, the excited state lifetimes of neutral (TiO 2 ) n clusters are measured. All clusters exhibit a rapid relaxation lifetime of ∼35 fs, followed by a sub-picosecond lifetime that we attribute to carrier recombination. The excited state lifetimes oscillate with size, with even-numbered clusters possessing longer lifetimes. Density functional theory calculations show the excited state lifetimes are correlated with charge carrier localization or polaron-like formation in the excited states of neutral clusters. Thus, structural rigidity is suggested as a feature for extending excited state lifetimes in titania materials.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Laser-Ablation Synthesis of Nanoparticles · Laser-induced spectroscopy and plasma · Electronic and Structural Properties of Oxides
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
Biodesign Center for Applied Structural Discovery, Arizona State University, Tempe, Arizona 85287, United States
Funding
Louis Stokes Alliance for Minority Participation (LSAMP) Bridge to Doctorate (BD) National Science Foundation
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