Abstract
Abstract The influence of either a magnetic or an electric field on transport properties of gases is based upon its effect upon the molecular angular momentum, which is no longer constant during free-flight motion between successive collisions; only its component along the field direction does not change. Previous chapters have been concerned essentially with rotational angular momentum alone (i.e. with diamagnetic molecules) and with linear Zeeman and Stark interactions. In the present chapter, we shall consider magnetic field-effects on the transport properties of gases of paramagnetic molecules possessing non-vanishing spin and/or electronic orbital angular momentum. In addition, we shall discuss anomalous behaviour of magnetic field-effects associated with molecules possessing a net nuclear spin angular momentum. Finally, we shall consider electric field-effects in gases of polar molecules which exhibit a transition from a quadratic Stark effect at low field strengths to a linear Stark effect at higher field strengths.
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