title: Compact ultrahigh vacuum/high-pressure system for broadband infrared sum frequency generation vibrational spectroscopy studies.
abstract: We have designed a compact ultrahigh vacuum/high-pressure system for in situ broadband infrared (IR) sum frequency generation vibrational spectroscopy (SFG-VS) studies. In this system, we have achieved a significant reduction in the distance between the sample and the optical window (<5 mm), which in turn considerably reduces the IR absorption from the gas phase under high pressure conditions. Moreover, with this new system, the IR transmission under high pressure conditions can be measured in situ for calibrating the SFG spectra. Therefore, this modified technique can allow us to study the vibrational spectra of adsorbates on single crystals or polycrystalline foils under high pressure. The preliminary results from SFG measurements of a model CH3OH/TiO2(110) system under both ultrahigh vacuum and high pressure conditions are reported here. These results suggest that this newly developed system is potentially a powerful tool for investigating adsorbate structures and surface reactions under both ultrahigh vacuum and real conditions.
authors.affiliation: International Center for Quantum Materials (ICQM) and School of Physics, Peking University, Beijing 100871, People's Republic of China and Collaborative Innovation Center of Quantum Matter, Beijing 100871, People's Republic of China.
authors.forename: Shuo
authors.initials: S
authors.lastname: Liu
authors.affiliation: International Center for Quantum Materials (ICQM) and School of Physics, Peking University, Beijing 100871, People's Republic of China and Collaborative Innovation Center of Quantum Matter, Beijing 100871, People's Republic of China.
authors.forename: An-An
authors.initials: AA
authors.lastname: Liu
authors.affiliation: International Center for Quantum Materials (ICQM) and School of Physics, Peking University, Beijing 100871, People's Republic of China and Collaborative Innovation Center of Quantum Matter, Beijing 100871, People's Republic of China.
authors.forename: Ruidan
authors.initials: R
authors.lastname: Zhang
authors.affiliation: International Center for Quantum Materials (ICQM) and School of Physics, Peking University, Beijing 100871, People's Republic of China and Collaborative Innovation Center of Quantum Matter, Beijing 100871, People's Republic of China.
authors.forename: Zefeng
authors.initials: Z
authors.lastname: Ren