Excimer laser drilling has been used to cut a 20-μm by 5-mm slot in the end of a closed Pyrex tube. The slot nozzle thus formed is suitable for production of a corona-excited supersonic expansion. The performance of the device has been characterized by recording the spectrum of the N+2B–X(0, 0) band at high resolution with the optical axis parallel to the slot and with the axis perpendicular to the slot (simulating a standard pinhole nozzle expansion) for comparison. The spectral lines recorded parallel to the slot nozzle are found to have a Doppler width such that a spin doubling of 0.06 cm−1 is resolved, while the pinhole-type spectrum resolves spin doubling of 0.09 cm−1. The slot nozzle also enhances the intensity of the spectrum, reducing recording time from 10 to 2 min, while maintaining the same approximate rotational temperature of 20–40% K.
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Choi et al. (1988) studied this question.
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