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Beam Action Spectroscopy via Inelastic Scattering BASIS Technique

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Presentation on theme: "Beam Action Spectroscopy via Inelastic Scattering BASIS Technique"— Presentation transcript:

1 Beam Action Spectroscopy via Inelastic Scattering BASIS Technique
Bobby H. Layne and Liam M. Duffy Department of Chemistry & Biochemistry, the University of North Carolina at Greensboro, Greensboro, North Carolina 27402 Hans A Bechtel, Adam H. Steeves and Robert W. Field Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

2 Talk Outline Photodissociation Experiments
Finding and Identifying an Anomaly Developing BASIS

3 Current Research Photodissociation of atmospheric molecules, characterizing quantum state distribution of products Crossbeam reaction dynamics Molecules studied - ozone, chlorine dioxide, hydrogen cyanide, chlorine

4 Experimental Setup InSb Hot Electron Bolometer Vacuum Chamber with
Diffusion Pump Below Teflon Window & Lens ULN6 preamp InSb Hot Electron Bolometer mm-Wave Source Module Pulsed Slit Nozzle Wire Grid Polarizer Used as Attenuator Rotation controlled by computer Mm-Wave power monitored by pulse modulating source Tunable UV from doubled OPO

5 mm-wave – Rotational Spectroscopy

6 Vacuum Chamber

7 J=4 J=3 J=1 J=5 J=0 J=2 J=0 J=6 J=6

8 Parent Molecule

9 Photodissociation of Parent Molecule

10 Current Photodissociation Study
hn Cl Cl O O O O Oxygen Chlorine Dioxide Chlorine Monoxide Parent Molecule Product Molecules

11 Probing Product Molecule
Cl O

12 UV action spectrum of O35ClO

13 UV action spectrum of O35ClO
(16,0,0) (15,0,0) (14,0,0) 1st Anomaly (17,0,0)

14 Hole is too deep! 2nd Anomaly

15 Parent Signal BASIS Signal

16 Ar Ar Ar Ar Ar Ar Ar Ar Ar Ar Ar Ar Ar Ar Ar Ar Ar Ar Ar Ar Ar
O C S O C S Ar O C S Ar Ar Ar Ar O C S O C S Ar Ar O C S Ar Ar Cl O O Ar Ar O C S Ar Ar O C S O C S O C S Ar Ar Ar O C S Ar O C S Ar Ar Ar O C S

17 BASIS Scan - OCS J = 6 J = 25

18 J = 25 J = 6

19 Rotational Distribution Shift - OCS

20 Developing BASIS

21 H-C C-H + OCS g H-C C-H + OCS
MIT’s Twist: BASIS used for Infrared Spectroscopy H-C C-H + IR g H-C C-H (vib. cold) (vib. hot) H-C C-H + OCS g H-C C-H + OCS (vib. cold) (vib. hot) (rot. hot) (rot. cold) collision Reporting Molecule

22 IR Spectroscopy of Vibrational Hot Acetylene - BASIS

23 Conclusion New spectroscopy technique for seeing “dark” molecules
May be applied to any energy transfer spectroscopy

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