Digital Control System for Microwave Spectroscopy Data Collection Amanda Olmut Dr. Stephen Kukolich, Principle Investigator Dr. Adam Daly, Project Lead.

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Presentation transcript:

Digital Control System for Microwave Spectroscopy Data Collection Amanda Olmut Dr. Stephen Kukolich, Principle Investigator Dr. Adam Daly, Project Lead University of Arizona April 16, 2016

Applications of Microwave Spectroscopy Accurate and precise method for measuring bond lengths and angles in free molecules The complete, accurate, 3-D structures obtained are very helpful in: Understanding reaction mechanisms Characterizing the bonding Characterizing electronic structures of molecules Tells us how a molecule will behave The frequencies measured provide positive identification of molecules observed in interstellar space 2-Fluorobenzoic Acid

Microwave Spectroscopy - Control System Integration of New Technology Molecules in the gas phase are pulsed into a chamber Microwave radiation excites the molecules and they transition to higher energy levels Molecules re-emit electromagnetic radiation Measure the free induction decay (FID) signal and use a Fourier transform on this signal Valve Signal Transmit Delay/Pulsewidth Receive

Old vs. New Old system – electronics developed in the lab New system: Used data acquisition boards from National Instruments Used LabVIEW to create an interface for automated or operator control of the spectrometer Ability to perform double resonance experiments Simplified, modern, and easy to copy Old System

Old vs. New LabVIEW Virtual Instrument Block Diagram

Old vs. New LabVIEW Virtual Instrument Front DiagramNational Instruments 6024 DAQ Board

Results FID Transform Rotational Spectroscopy B-typeA-type

Conclusions Sophisticated control system Able to scan large frequency regions and analyze complex spectra Successfully performed double resonance experiment Future Work Engineering task – optimizing our system Testing Laser fragmentation experiment on another spectrometer Make sigma 3 detection (currently sigma 1.5 detection) for double resonance

Acknowledgements This project would not have been possible without NASA, Arizona Space Grant Consortium, Dr. Kukolich and Dr. Daly, and the UA Department of Chemistry and Biochemistry.

Thank you!