Chemistry

Problem

A researcher wishes to determine the permanent dipole moment of small polar molecules by monitoring transitions between adjacent rotational energy levels. Which radiation source should the spectrometer employ? a) An ultraviolet lamp centered at

250\,\text{nm}

b) A continuous-wave infrared laser at

1064\,\text{nm}

c) A tunable microwave cavity emitting radiation of about

3\,\text{cm}

wavelength d) A

\gamma

-ray source producing photons with

E>1\,\text{MeV}

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