https://blog.gongquiz.com/2022/06/07/ir-spectroscopy-%ec%9d%98-%ec%a0%81%ec%99%b8%ec%84%a0-%eb%b3%80%ed%99%98%ea%b8%b0%eb%a1%9c-%ec%82%ac%ec%9a%a9%eb%90%98%ec%a7%80-%ec%95%8a%eb%8a%94-%ea%b2%83%ec%9d%80-%ed%99%94%ed%95%99%eb%b6%84/