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physical object > natural object > particle > molecule > diatomic molecule > hydroxyl radical

hydroxyl radical (OH)
subject			fact

hydroxyl radical	has symbol OH
	has definition An interstellar molecule first detected in 1963 at a wavelength of 18 cm. The four transitions that occur near 18 cm are caused by the splitting of the ground level. Galactic OH sources have been divided into three classes according to whether the OH emission is strongest in the main lines, particularly at 1665 MHz (Class 1), whether the emission and absorption are highly anomalous only in the satellite lines (Class 2) (Class 2a, 1720-line emitters; Class 2b, 1612-line emitters), or whether there is only absorption in all four lines (Class 3).
	is an instance of interstellar molecule
	is an instance of diatomic molecule
interstellar molecule	has discovery in space date
diatomic molecule	has decompostion temperature < 10000 K
particle	obeys uncertainty principle
	has frequency inversely proportional to the wavelength
	has wavelength inversely proportional to its momentum
	has charge
	has mass
physical object	has location or center of gravity
	has angular momentum
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

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