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Quantum Rotational Dynamics of CH 3 I

Quantum Rotational Dynamics of CH 3 I. Group D. Y Liu, S Jonas, V Atakan, H Wu, S Omar-Diallo, I-K. Jeong D. Phelan. System description. V3. Methyl Iodide. Three fold potential model. Numerical Values of Energy Level. Experimental Goals. What we are looking for:

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Quantum Rotational Dynamics of CH 3 I

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  1. Quantum Rotational Dynamics of CH3I Group D Y Liu, S Jonas, V Atakan, H Wu, S Omar-Diallo, I-K. Jeong D. Phelan

  2. System description V3 Methyl Iodide Three fold potential model

  3. Numerical Values of Energy Level

  4. Experimental Goals • What we are looking for: • The “height”of the V3 well • The librational energy • The projected radius of Hydrogen from Carbon

  5. Why HFBS and FANS? • The tunneling energy is quite small • Tunneling process have energies on order of ~ meV • The HFBS has high resolution. ~1 meV, well below the conventional triple-axis and neutron TOF spectrometers. • The FANS has high energy transfer (~100meV)

  6. HFBS and FANS diagram:

  7. How HFBS works • The HFBS varies incident energy by using a cam-based Doppler-driven monochromator. • Phase Space Transformer increase flux 4x. Very large analyzer array, 20% of 4p. • The scattering chamber is operated under vacuum • instead of Ar or He improving the signal-to-background ratio.

  8. Inelastic Scattering (T = 8K) Tunneling Energy: ~2.3meV V3 ~ 42meV

  9. Quasielastic Analysis (T = 38K) Elastic and Quasielastic Peak EISF Fitting Jump Diffusion Model: • Rexp =1.03A • Rcal =1.027A

  10. Librational Energy Study by FANS 1st libration energy: ~14meV

  11. Acknowledgement • NIST • Zema Chowdhuri, Robert Dimeo (HFBS) • Craig Brown (FANS) • Members of Group D, summer school 2003

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