Molecular Rotational Spectra Techniques

The microwave spectroscopy group at Missouri S&T houses three instruments: 2 Fourier transform microwave (FTMW) spectrometers and 1 chirped-pulse Fourier transform microwave (CP-FTMW) spectrometer. One FTMW is functional in the 3-26 GHz range (currently constructed) and the other FTMW is functional in the "typical" 6-26 GHz region. The CP-FTMW, as currently constructed is functional in the range of 6-18 GHz. We are currently looking to extend the CP-FTMW range to 2-18 GHz and finish rebuilding the second FTMW spectrometer.

CP-FTMW spectrometer

The CP-FTMW instrument has been built and is currently being fit with a laser ablation source. It features a fast, 50 GS/s arbitrary waveform generator and The CP-FTMW is a hybrid of that developed by Prof. Brooks Pate and that utilized by Prof. Stephen Cooke. Instead of the "typical" high-powered (≥0.5 kW) designs used by the Pate group or the "low-power" designs used by the Cooke group (5 or 10W), our instrument features a 40 W solid state amplifier with a TTL control to generate a polarization microwave pulse in ≤5 μs.

The spectrometer has already been employed to study multiple molecular systems. We are currently collaborating with Prof. Durig of UM-Kansas City to look at ring molecules along with collaborating with Profs. Sean and Rebecca Peebles on van der Waals interactions with large fluorinated organic species. We are currently in preparation of a manuscript on a few fluorinated organics highlighting the experimental details.

FTMW spectrometers

One FTMW instrument, functional in the 3-26 GHz range, has been reassembled from its original owner, designer, and constructor, Brian Howard at Oxford University. It features a good sensitivity (Q is on the order of 20000) while also having an ability to lower the Q value in order to broaden search regions with microwave foam. The system is automated and set up on individual software written by Brian Howard in-house. The spectrometer is fitted with Helmholtz coils to negate the Earth's magnetic field to aid in the determination of open-shell species.

Currently, projects with this instrument include searches for N2-O2 and CO-O2 van der Waals complexes.

High Frequency, Microwave Thermography, and Microwave Photonics

Our group is currently working on design and implementation of a 70-110 GHz microwave experiment. This is to be used on our actinide-containing molecules and complexes.

In addition to the high frequency spectrometer, we are collaborating with some professors at Missouri S&T in Electrical Engineering to work on microwave photonics spectroscopic and microwave thermography techniques.