1994 | OriginalPaper | Chapter
Optical Spectroscopy in Emission Measurements
Author : Heikki Torvela
Published in: Measurement of Atmospheric Emissions
Publisher: Springer London
Included in: Professional Book Archive
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The energy of molecules is the sum of translational, rotational, vibrational and electronic energies: <m:math display='block'> <m:mrow> <m:msub> <m:mi>E</m:mi> <m:mrow> <m:mtext>mol</m:mtext> </m:mrow> </m:msub> <m:mtext> = </m:mtext><m:msub> <m:mi>E</m:mi> <m:mrow> <m:mtext>trans</m:mtext> </m:mrow> </m:msub> <m:mtext> + </m:mtext><m:msub> <m:mi>E</m:mi> <m:mrow> <m:mtext>rot</m:mtext> </m:mrow> </m:msub> <m:mtext> + </m:mtext><m:msub> <m:mi>E</m:mi> <m:mrow> <m:mtext>vib</m:mtext> </m:mrow> </m:msub> <m:mtext> + </m:mtext><m:msub> <m:mi>E</m:mi> <m:mrow> <m:mtext>el</m:mtext> </m:mrow> </m:msub> </m:mrow> </m:math>$$ {E_{{\text{mol}}}}{\text{ = }}{E_{{\text{trans}}}}{\text{ + }}{E_{{\text{rot}}}}{\text{ + }}{E_{{\text{vib}}}}{\text{ + }}{E_{{\text{el}}}} $$ From the point of view of the molecular spectra, translational energy Etrans is not of considerable importance, and can be neglected [101]. Rotational energy can have some significance, above all in small molecules in a gaseous state, which can rotate relatively freely.