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Raman Effect And Micro- raman Spectroscopy 拉曼效應與微拉曼光譜儀

Raman Effect And Micro- raman Spectroscopy 拉曼效應與微拉曼光譜儀. Student : 王維勤 Student ID : MA2L0205 Advisor : 吳坤憲. Outline. Introduction Raman effect Micro-Raman Spectroscopy. Why the Oceans Are Blue?. Introduction.

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Raman Effect And Micro- raman Spectroscopy 拉曼效應與微拉曼光譜儀

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  1. Raman Effect And Micro-raman Spectroscopy拉曼效應與微拉曼光譜儀 Student : 王維勤 StudentID :MA2L0205 Advisor : 吳坤憲

  2. Outline • Introduction • Raman effect • Micro-Raman Spectroscopy

  3. Why the Oceans Are Blue?

  4. Introduction • In 1928, C.V.Raman found when the light is scattered, the frequency of scattering light will change in the gas and liquid. The change in frequency is determined the material characteristics when it scattering light. C. V. Raman (1888-1970)

  5. Introduction  0 inelastic scattering light elastic scattering Light 0 Incident Light 0 Transmitted light0 Reflected light 0

  6. Introduction • Scattering light most belong to the elastic scattering, also known as Rayleigh scattering. • Very small portion of the scattered light are inelastic scattering, the frequency will change after scattering. • E=h0 • Generate energy exchange, and energy of the incident light are not the same. 0

  7. Raman Effect • Inelastic scattering also known as Raman scattering, refers to the frequency changing when the light are scattered. • When light enters the sample surface and molecular collisions, the molecular excitation energy to a virtual state, then scattering way to release energy.

  8. Raman Effect

  9. Raman Effect • Scattering Light • Scattering Light Frequency = Incident Light Frequency (Rayleigh Scattering) • Scattering Light Frequency > Incident Light Frequency (Anti stokes line) • Scattering Light Frequency = Incident Light Frequency (Stokes line) = 0 - (0 -) = (0 + ) - 0 = 一般偵測拉曼光譜偵測的是散射光子與入射光子的頻率差，稱之為Raman shift。 Stoke line • E=h(0 -) • Anti Stokes line • E=h(0 + ) • Anti Stokes line Rayleigh Scattering Stoke line 0 0 + 0 -

  10. Micro-Raman Spectroscopy Laser sample CCD computer Spectroscope 利用CCD(光學多頻道分析儀)的拉曼光譜儀

  11. Micro-Raman Spectroscopy Incident Light Incident Light Sample Scattering light Sample Scattering light Reflected light Incident Light Sample Sample Incident Light Incident Light Scattering light Scattering light

  12. Micro-Raman Spectroscopy 探測器 前置單色器 分光儀(光譜儀)

  13. Micro-Raman Spectroscopy Laser wavelength : 325nm、532nm、633nm

  14. Micro-Raman measurements 根據橫向光學聲子模型可以得知 (Transverse Optical phonon, TO mode) 非晶鍺-鍺鍵結光譜峰值位於~270cm-1 結晶鍺-鍺鍵結光譜峰值位於~300cm-1 鍺-矽鍵結光譜峰值位於~400cm-1 非晶矽-矽鍵結光譜峰值位於~486cm-1 結晶矽-矽鍵結~520cm-1 Micro -Raman measurements are performed at room temperature under excitation at 532 nm of Nd: YAG laser. Film thickness~100nm

  15. Micro-Raman measurements • According to the transverse optical phonon model (TO mode), wecan know: • The peak position indicates the composition and structure of the sample. • Intensity spectrum shows the concentration of an ingredient

  16. Thanks for your attention

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