上海大学《仪器分析 - Instrumental Analysis》（英文版）_Chapter 1-5

2. Atomic spectrometry system Atomic Absorption Atomic Emission Monochromator or Detector ap Flame Monochromator Detector Flame or Plasma Polychromator Atomic Fluorescence Atomic Mass Spectrometry Plsma Mass Spectrometer Detector Flame or Monochromator Detect Plasma Figure 2-4. Atomic spectrometry systems

2. Atomic spectrometry system

3. Dispersion (1)By a Prism oo Fig 2-5 Dispersion of white light by prism

3. Dispersion ⑴By a Prism

(2)By a Grating Incident Light 2 Incident Light 2 Blaze Wavelength 1 Fig 2-6 Dispersion by grating 2:2,d1

⑵By a Grating

Grating Equation mn=sinc±sinb (23) For a blazed reflection grating(echelette) AIyB=Sa B (2.4) Where β: blaze angle, nr: number of grooves/mm, 2: wavelength, m: grating order a: incident angle, 0: diffracted angle

Grating Equation Where: : blaze angle, nr : number of grooves / mm, : wavelength, m: grating order : incident angle, : diffracted angle, mnr  = sin sin  For a blazed reflection grating (echelette) mnr  = 2sin  (2.3) (2.4)

Angle dispersion of a grating de mn (2.5) dn cos e linear dispersion dn cOs (26) Reciprocal linear dispersion D, dn cos 6 27) dx mn, f

linear dispersion    cos mnr d d =  cos mn f d dx r = Reciprocal linear dispersion Dr dx mn f d D r r  cos = = Angle dispersion of a grating (2.5) (2.6) (2.7)