彗星化学是研究彗星的彗发和彗尾的化学组成及其在太阳辐射和太阳风作用下发生的光化学反应、离子-分子反应,进而推测彗核的化学组成。有关彗发、彗尾和彗核的化学组成、化学反应非常复杂,迄今远没有了解清楚。哈雷彗星再次回归,为这项研究提供了难得的机会, Comet chemistry is to study the chemical composition of the comet’s comet and comet tail and its photochemical reaction, ion-molecule reaction under solar radiation and solar wind, and then speculate on the chemical composition of the nucleus. Chemical composition of the coma, comet tail and the nucleus of the nucleus, the chemical reaction is very complicated, far far from clear understanding. Halley comet return again, providing a rare opportunity for this study,