Astrochemistry
The field of observational astrochemistry is at an important stage in its development. Several large millimeter telescopes are currently in operation. By applying spatial resolution, sites of complex molecular structure can be separated from the overall cloud structure. More importantly, many interferometers are in operation (such as BIMA in California and IRAM near Grenoble) or are being built (ALMA in Chile). Several large aperture millimeter and submillimeter telescopes are now available (such as the JCMT at Mauna Kea). These provide a detailed projection map of the cloud into particle lines. Extragalactic astrochemistry is growing and many galaxies have now been studied in diatomic and even more complex forms. A critical step in determining abundance, and whether these reflect local chemistry or stimulus conditions, can only be accomplished through comparisons between species that identify each. The coming years promise to achieve this goal. In this review, we present the first ste