Note to moderator: please read the answerline carefully. Some molecular dimers can display two values of this measured quantity due to Davydov splitting. When placed in solution, PIC (“P-I-C”) chloride experiences an increase in this quantity due to supramolecular self-aggregation, making a structure called a J-aggregate. Shifts that increase or decrease this non-dimensionless quantity are respectively named using the prefixes “batho” and “hypso.” By counting features like alkyl groups, (*) exocyclic double bonds, and bonds that extend conjugation, one can estimate this quantity with the Woodward-Fieser rules. When measuring concentration with Beer's law, you should first find this quantity to increase the measurement’s signal-to-noise ratio. For 10 points, name this quantity, the color of light that produces the biggest signal in absorption spectra. ■END■
ANSWER: maximum wavelength of absorption [or lambda-max; or the primary absorption wavelength in UV-Vis spectroscopy; accept answers that use peak, largest, biggest, or other synonyms in place of “maximum”; BEFORE “self-aggregation”, accept answers that say frequency or energy in place of the word “wavelength”, reject answers with “frequency” or “energy” after “self-aggregation”; prompt on wavelength or lambda; reject “absorbance”]
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= Average correct buzz position