Question

Compared with dispersive method, the Fourier-transform technique can give great benefit for IR absorption spectrometry, but not much for UV-Vis absorption spectrometry. Select from below (1-3) all the causes of the difference between IR and UV-Vis: (1) The intensity of IR light sources is much lower than that of UV-Vis; (2) The response of IR detectors is much worse than that of UV-Vis; (3) The monochromator slit in dispersive instrument for IR needs to be very wide, in the range of IR peak width, while, in UV-Vis, the slit is much narrower than peak width; 1&3 1&2 1,2&3 2&3

          Compared with dispersive method, the Fourier-transform technique can give great benefit for IR
absorption spectrometry, but not much for UV-Vis absorption spectrometry. Select from below (1-3)
all the causes of the difference between IR and UV-Vis:

(1) The intensity of IR light sources is much lower than that of UV-Vis;

(2) The response of IR detectors is much worse than that of UV-Vis;

(3) The monochromator slit in dispersive instrument for IR needs to be very wide, in the range of IR
peak width, while, in UV-Vis, the slit is much narrower than peak width;

1&3
1&2
1,2&3
2&3

Compared with dispersive method, the Fourier-transform technique can give great benefit for IR
absorption spectrometry, but not much for UV-Vis absorption spectrometry. Select from below (1-3)
all the causes of the difference between IR and UV-Vis:

(1) The intensity of IR light sources is much lower than that of UV-Vis;

(2) The response of IR detectors is much worse than that of UV-Vis;

(3) The monochromator slit in dispersive instrument for IR needs to be very wide, in the range of IR
peak width, while, in UV-Vis, the slit is much narrower than peak width;

1 3
1 2
1,2 3
2 3

Added by Luc-A G.

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