Spectra of the comae of four comets were obtained with an integral field unit spectrograph on the Harlan J. Smith Telescope at McDonald Observatory. The passband of the spectrograph permitted the observation of C₂, C₃, CH, CN, and NH₂ transitions for these comets. The classical Haser model was used to derive production rates for each observed species. The production rates obtained for the comets were also used to obtain mixing ratios relative to CN. The relative abundances with respect to CN obtained for these comets vary greatly, but are largely consistent with ranges established from prior comet chemistry surveys. The notable exception is 168P/Hergenrother, which the results suggest is extremely depleted in volatiles, even with respect to many other comets designated as volatile depleted in prior surveys. The results for comet Hergenrother add to a small, but growing, body of data suggesting that there may be a subgroup of carbon-chain-depleted Jupiter-family comets that are also depleted in ammonia.

在麦当劳天文台的Harlan J. Smith望远镜上用积分场单位光谱仪获得了四颗彗星彗差的光谱。光谱仪的通带允许观察C ₂，C ₃，CH，CN和NH ₂这些彗星的过渡。经典的Haser模型用于得出每个观察到的物种的生产率。彗星获得的生产率还用于获得相对于CN的混合比。这些彗星获得的相对于CN的相对丰度差异很大，但与先前彗星化学调查确定的范围基本一致。值得注意的例外是168P / Hergenrother，其结果表明，挥发物极度耗尽，即使相对于先前调查中指定为消耗挥发物的许多其他彗星也是如此。Hergenrother彗星的结果增加了一个很小但不断增长的数据，表明可能存在碳链贫化的木星家族彗星的一个子集，该子集也贫了氨。