Abstract
A proposal is given to use the transition of the HeH+ (2.0 THz), NeH+ (1.0 THz), and ArH+ (0.62 THz) molecular ions as novel frequency standards in the terahertz region. This transition is free from the electric-quadrupole shift, and the DC Stark and Zeeman shifts are much less than those of the CaH+ and MgH+ molecular ions. These transitions are useful for locking the frequencies of oscillators like quantum cascade lasers (QCL) or resonant tunnel diodes (RTD) with uncertainties of 10−15.
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