A Chirped Pulse Fourier Transform Microwave CPFTMW Spectrometer

A Chirped Pulse Fourier Transform Microwave (CP-FTMW) Spectrometer with Laser Ablation Source to Search for Actinide-Containing Molecules and Noble Metal Clusters F. E. Marshall, David Joseph Gillcrist, Thomas D. Persinger, Nicole Moon, and G. S. Grubbs II 71 st International Symposium on Molecular Spectroscopy June 20 -24, 2016, Urbana-Champaign, IL, USA; MJ 12

Systems of Interest- Actinide. Containing Molecules • Spin-Orbit Interactions • Computational Difficulties • f-electron Chemistry

Systems of Interest- Noble Metal Clusters Picture taken from D. J. Frohman, G. S. Grubbs II, Z. Yu and S. E. Novick, "Probing the Chemical Nature of Dihydrogen Complexation to Transition Metals, a Gas Phase Case Study: H 2– Cu. F. " Inorg. Chem. 2013, 52, 816 -822. Picture taken from K. Duanmu and D. G. Truhlar, "Partial Ionic Character beyond the Pauling Paradigm: Metal Nanoparticles. " J. Phys. Chem. C 2014, 118, 28069 -28074. • Heterogeneous Catalysis (preferential sites for CO + O 2 to give CO 2, etc. ) • Fundamental Interest (dipole moments that break the Pauling Model; typical vd. W bonding interactions with Noble Metal species have resulted in covalent bond tendencies)

Previous Work- Brooks Pate

Previous Work- Brooks Pate C. Pérez, M. T. Muckle, D. P. Zaleski, N. A. Seifert, B. Temelso, G. C. Shields, Z. Kisiel, B. H. Pate, Science, 336(2012), No. 6083, 897.

Previous Work- Steve Cooke

Previous Work- Steve Cooke G. S. Grubbs II, C. T. Dewberry, K. C. Etchison, K. E Kerr, and S. A. Cooke Rev. Sci. Instr. 78 (2007) 096106.

Our CP-FTMW

Our CP-FTMW Top: A 9 -15 GHz sweep of 3% OCS in Ar after 30, 000 averaging cycles. Transitions have been identified for minor isotopologue and vibrationally excited species of OCS as well as Ar and H 2 O dimer species. Bottom: A zoom-in of the 11800 MHz to 12150 MHz region showing isotopic and quadrupole levels of resolution with the technique.

Our CP-FTMW Schematic of the CP-FTMW with laser ablation source. The components are: 1. SRS® FS 725 10 MHz Rb frequency standard; 2. SRS® FS 725 Signal Distributor; 3. Tektronix® AWG 70001 A 20 GHz/50 GS/s Arbitrary Waveform Generator; 4. Microsemi® L 0618 -46 -T 680 6 -18 GHz, 40 W Power Amplifier; 5. Q -par® QWH-SL-2 -18 -S-HG-R 2 -18 GHz High Gain, Broadband Horn Antennae; 6. Advanced Technical Materials® S 1517 D 0. 5 -18 GHz, 75 W Pin Diode SPST Switch; 7. Miteq® AMF-7 D-01001800 -22 -10 P Low Noise Amplifier, 55 d. B, 1 -18 GHz; 8. Tektronix® DPO 72304 DX 23 GHz/100 GS/s Digital Phosphor Oscilloscope; 9. Quantum Composers® 9514+ Pulse Generator; 10. Parker® Series 9 Solenoid Valve with Walker-Gerry Ablation Attachment; 11. Continuum® Minilite II 50 m. J@1064 nm pulsed Nd: YAG Laser, 15 Hz.

Laser Ablation Setup LASER

Laser Ablation Setup

Laser Ablation Setup

Laser Ablation Setup

Our LA-CMB-CP-FTMW

Acknowledgements • Missouri S&T Startup • UM Research Board Grant