单项选择题
A1型题
下列哪种原子荧光是反Stokes荧光（）
A.Cr吸收359.35nm，发射357.87nm
B.Pb吸收283.31nm，发射283.31nm
C.Pb吸收283.31nm，发射405.78nm
D.In吸收377.55nm，发射535.05nm
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相关考题
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单项选择题
下列跃迁形式中，哪一种产生的是共振荧光（）
A.A
B.B
C.C
D.D -
单项选择题
One of the main advantages of a graphite-furnace atomizer is that（）
A.It requires only very small quantities of a sample
B.It requires metal.ions in aqueous solution
C.It does not produce background emission like a flame
D.It does not get hot like a flame -
单项选择题
The purpose of the ashing step in graphite-furnace atomic-absorption spec-troscopy is to（）
A.Vaporize metal atoms to be analyzed
B.Cause the metal species to form carbides which are more volatile
C.Convert the graphite furnace to ash to avoid carbide formation
D.Burn off organic species that would interfere with the elemental analysis
