B E Long and S A Cooke Funded by the Department of Energy Background 1981 BalleFlygare Cavity FTMW facilitated the rotational spectroscopic study of transient species 1989 Suenram ID: 185265
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MICROWAVE FREQUENCY TRANSITIONS REQUIRING LASER ABLATED URANIUM METAL DISCOVERED USING CHIRP-PULSE FOURIER TRANSFORM MICROWAVE SPECTROSCOPYB. E. Long and S. A. Cooke
Funded by the Department of EnergySlide2
Background1981: Balle-Flygare Cavity FTMW facilitated the rotational spectroscopic study of transient species1989:
Suenram, Lovas, Matsumura incorporate a laser ablation source
2005: Pate and co-workers implement a chirp pulse FTMW spectrometer
Great resolution and sensitivity
“Non-specific production source” *
“The search is over” **
* This meeting: Crabtree, McCarthy RE03, see also and
Zaleski
, Stephens, Walker,
Legon
FD09
** Talk FC03, 60
th
ISMS, 2005Slide3
UraniumToxicDust is pyrophoric
Radioactive (a-decay, t
1/2 = 4.46 x 109 years)
Lots of bureaucracy
Factor that has been most
deleterious to my healthSlide4
G. S. Grubbs II, R. A.
Powoski
, D.
Jojola
and S. A. Cooke.
J. Phys. Chem. A
114
(2010) 8009
.
Experiment covers 7 GHz to 18 GHz. Picture credit: C. T. Dewberry.Slide5
Laser onLaser off
OCS
Scale is in MHzSlide6
12050 line. 10 shots.
None of the observed lines exhibit structure.Slide7
U-requiring transitionsFrequency / MHzS/N in O2
S/N in Ar7999.8894
55/115/18798.7844
11/1Not Present9681.3895
3/1Not Present11181.0201
21/1
3/1
11926.976
74/1
21/1
11948.8033
3/1
Not Present
12050.3949
15/1
6/1
12173.5944
11/1
3/1
Assignments not available at present.
Double resonance experiments inconclusive to date.Autofit software finds multiple 3, and 4 line fits.Slide8
UO
3
is T-shapedSlide9
Line Freq / MHz QN’s Obs-Calc 2 11181.019 4 2 2 4 1 3 .148243 6 12440.697 4 2 3 3 3 0 .000000 7 15723.489 5 2 3 5 1 4 -.039173 8 18301.569 8 4 4 8 3 5 -.056911 Expt’lA = 7764.89 MHzB = 5013.92 MHzC = 3054.41 MHzUO3 Calc’d
A = 7767.7 MHzB = 5043.6 MHzC = 3058.0 MHzLine Assigner Fit’s
Look’s great
but
lines are predicted that we don’t see.Slide10
Department of Energy – “Experimentally characterizing the electronic structures of f-electron systems using advanced high resolution Fourier transform microwave spectroscopies”
Stew Novick, Dan Obenchain
, Pete Pringle and all members of the Southern New England Microwave Spectroscopy Consortium.
Oxygen-17/18 experiments will be attempted in the near futureStark experiments
E-band measurements
Acknowledgements
To do:Slide11
http://specfitter.droppages.com/