Raman spectroscopy

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1. Raman Spectroscopy

본 실험에서는 대표적인 분광학적 분석법인 Raman spectroscopy를 이용해 각기 다른 세 온도에서의 DCE Raman spectrum을 얻고, DCE rotamer의 peak를 확인한 후 anti-form과 gauche-from의 peak 면적을 통해 두 rotamer의 에너지 차이를 계산한다. 각각 196K 시료는 드라이아이스를 acetone bath에 넣어서, 273K 시료는 얼음으로 얼려서, 298K 시료는 상온에서 준비했으며 expose time을 1s로, accumulation number를 1회로 하여 각 시료의 Raman spectrum을 얻었다. 그 결과 raw Raman spectrum에서 196K DCE의 경우 anti-form에 해당하는 하나의 peak을, 273K과 298K DCE의 경우 gauche-form과 anti-form에 해당하는 7개의 서로 다른 peak을 찾을 수 있었다. 여기서 anti-form과 gauche-form 사이의 rotation energy barrier를 구하기 위해 273K과 298K DCE에서 얻은 655cm의 gauche-form peak, 755cm에서의 anti-form peak을 이차다항식 근사를 통한 baseline correction을 진행한 후 면적을 구해 그 비율을 계산했다. 계산 결과 rotation energy barrier는 의 양의 값으로 계산되었고, 이는 일반적인 steric effect에 의한 anti-form rotamer의 안정성과 다른 경향을 보이는 것으로 나타났다. 이에 본 실험에서는 DCE의 polarity로 인한 안정화 효과가 gauche-form에서 더 크기 때문에 gauche-form이 anti-form보다 더 안정하게 존재할 수 있다는 것을 논의하고 rotation energy barrier를 더 정확하게 구하기 위한 실험의 오차 개선 방안에 대해 탐구한다.

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1. Raman Spectroscopy

Raman spectroscopy is a powerful analytical technique that provides valuable information about the molecular structure and composition of materials. It is a non-destructive method that can be used to study a wide range of materials, including solids, liquids, and gases. The technique is based on the inelastic scattering of monochromatic light, typically from a laser source, by the molecules in a sample. When the light interacts with the molecules, the energy of the photons can be shifted up or down, resulting in a shift in the wavelength of the scattered light. This shift, known as the Raman shift, is unique to the specific molecular bonds and vibrations within the sample, and can be used to identify the chemical composition and structure of the material. One of the key advantages of Raman spectroscopy is its ability to provide detailed information about the molecular structure of a sample without the need for complex sample preparation. This makes it a valuable tool for a wide range of applications, including materials science, chemistry, biology, and medicine. In materials science, Raman spectroscopy can be used to study the properties of materials such as polymers, ceramics, and semiconductors, and to monitor the progress of chemical reactions and phase changes. In biology and medicine, Raman spectroscopy can be used to study the structure and function of proteins, nucleic acids, and other biomolecules, and to detect and diagnose diseases. Despite its many advantages, Raman spectroscopy also has some limitations. The Raman effect is relatively weak, and the intensity of the Raman signal can be influenced by factors such as the wavelength of the laser, the concentration of the sample, and the presence of interfering substances. To overcome these challenges, researchers have developed a number of techniques, such as surface-enhanced Raman spectroscopy (SERS) and coherent anti-Stokes Raman spectroscopy (CARS), which can enhance the Raman signal and improve the sensitivity and selectivity of the technique. Overall, Raman spectroscopy is a powerful and versatile analytical tool that has a wide range of applications in science and technology. As the field continues to evolve, it is likely that we will see even more exciting developments and applications of this important technique.

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