Abstract

The design of a new high-pressure infrared (IR) cell for carrying out picosecond time-resolved infrared (<i>ps</i>-TRIR) spectroscopy in supercritical fluids is described. We have employed thin (2 mm) MgF₂ windows in order to overcome possible undesirable nonlinear optical effects caused by the extremely high peak powers of ultrashort ultraviolet (UV)/visible pulses. The design of our cell allows for the study of systems at pressures of up to 5500 psi at temperatures of up to approximately 50 °C. The MgF₂ windows enable the excitation of samples with both UV and visible light pulses and these windows are transparent across much of the mid-infrared region. We have demonstrated the use of this cell by examining the photochemistry of Fe(CO)₅ in supercritical Kr (<i>sc</i> Kr).

High-pressure cell for terahertz time-domain spectroscopy

Wei Zhang, Daniel Nickel, and Daniel Mittleman
Opt. Express 25(3) 2983-2993 (2017)

Time-resolved optical probing of the non-equilibrium supercritical state in molecular media under ns laser-plasma impact

Evgenii Mareev, Nikita Minaev, Evgenii Epifanov, Ivan Tsymbalov, Alexander Sviridov, and Vyacheslav Gordienko
Opt. Express 29(21) 33592-33601 (2021)

Generation of an adjustable multi-octave supercontinuum under near-IR filamentation in gaseous, supercritical, and liquid carbon dioxide

Evgenii Mareev, Viktor Bagratashvili, Nikita Minaev, Fedor Potemkin, and Vycheslav Gordienko
Opt. Lett. 41(24) 5760-5763 (2016)

Picosecond time-resolved vibrational spectroscopy using a regenerative amplifier

T. M. Jedju, M. W. Roberson, and L. Rothberg
Appl. Opt. 31(15) 2684-2691 (1992)

Stimulated Rayleigh and Brillouin scattering in a supercritical fluid

Konstantinos S. Kalogerakis, Benjamin H. Blehm, Rachel E. Forman, Christian Jirauschek, and Gregory W. Faris
J. Opt. Soc. Am. B 24(9) 2040-2045 (2007)