Beam Action Spectroscopy via Inelastic Scattering BASIS Technique

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Presentation transcript:

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

Talk Outline Photodissociation Experiments Finding and Identifying an Anomaly Developing BASIS

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

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

mm-wave – Rotational Spectroscopy

Vacuum Chamber

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

Parent Molecule

Photodissociation of Parent Molecule

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

Probing Product Molecule Cl O

UV action spectrum of O35ClO

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

Hole is too deep! 2nd Anomaly

Parent Signal BASIS Signal

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

BASIS Scan - OCS J = 6 J = 25

J = 25 J = 6

Rotational Distribution Shift - OCS

Developing BASIS

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

IR Spectroscopy of Vibrational Hot Acetylene - BASIS

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