Ch. 6. 분광분석(SPECTROSCOPY)

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Ch. 6. 분광분석(SPECTROSCOPY) 빛(Light) 입자/파동의 이중성(dual property) 분광분석에서는 파동의 성질을 이용 – 빛은 전자기파(electromagnetic wave) http://www.ndt-ed.org/EducationResources/CommunityCollege/RadiationSafety/theory/nature.htm

Ch. 6. 분광분석(SPECTROSCOPY) 빛의 속도: ≈300,000km/s 𝑐=𝜆𝜈 (파장*진동수) 빛의 에너지: 진동수에 의해서만 결정 𝐸=ℎ𝜈=ℎ 𝑐 𝜆 (h: Plank’s constant=6.62606957*10-34 J.s=4.135667516*10-15 eV.s)  분광분석학의 가장 기초적인 원리: 다양한 물리-화학적 현상들은 각기 다른 수준의 에너지를 흡수 방출 한다 에너지 수준에 따른 해당 파장의 전자기파를 흡수하거나 방출하는 성질을 이용하여 분석

Ch. 6. 분광분석(SPECTROSCOPY) Spectrum of Light Wave type Wavelength (cm) Electric 1010-106 Radio 106-102 Microwave 102-10-2 Infrared 10-2-7.7×10-5 Visible 7.7×10-5-3.9×10-5 Ultraviolet 3.9×10-5-10-6 X-Rays 10-6-10-9 Gamma rays 10-9-10-12

http://www. science4heritage. org/survenir/approach/ http://www.science4heritage.org/survenir/approach/?c=NIR-spectroscopy

Ch. 6. 분광분석(SPECTROSCOPY) Units Unit prefixes p = pico = 10-12 n = nano = 10-9 μ = micro = 10-6 m = milli = 10-3 K = killo = 103 M = mega = 106 G = giga = 109 T = tera = 1012

Ch. 6. 분광분석(SPECTROSCOPY) Frequency units Hz (hertz) -- KHz, MHz, GHz ( c (cycle); old notation, but still being used) Wavelength units m, mm, μm, nm, etc. Å=10-8 cm -- X-Ray 연구에서 사용 몇몇 틀린 단위 (예전에는 사용되었음) μ --> μm mμ --> nm

Ch. 6. 분광분석(SPECTROSCOPY) Energy units erg = g cm2/sec eV = 1.602×10-12 erg cm-1 (wavenumber) = 1.99×10-16 erg cal = 4.18×109 erg = 4.18 J