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In this paper we fit low-resolution spectra of pyrazine by assuming Coriolis coupling between SJ and {So}. Evidence for Coriolis coupling is particularly obvious in the rovibronic spectra of pyrazine-d 3 h J of which we give high resolution examples. For the lowest rotational. . temperature we noticed a non-Boltzmann distribution of the J" = 0 ground state, which IS probably caused by a bottleneck for 6.J" =-2 transitions. Using the .lifetimes of ~ol~cular eigenstates belonging to P(1) we can calculate the absolute quantum Yield of the vlbratlOnless and rotationless IB 3u state. Using this number and the obtained interstate Coriolis coupling rate constants we calculate the variation of the absolute quantum yield across the rotational contour. For low J we get satisfactory agreement with experiments, but for high Jour calculations drop off too fast with J. We explain this by the fact that at high J values triplet decay becomes dominant because of K scrambling in the triplet manifold.

Fibre Optic sensors are found to be very suitable for explosion and shock wave measurements because they are immune to Electromagnetic Interference (EMI). In the past few years, TNO has developed a number of sensor systems for explosion and shock wave measurements in which the optical fiber is a vital component. This paper presents a survey of these optical measurement systems using fibre optics. The basic design ofthese systems, the test configurations and the experimental results are presented.

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The spectrum of the molecular eigenstates (ME) belonging to the various rotational members of the 1B3u (0-0) transition of pyrazine was measured with a very narrow band laser in a molecular beam with a Doppler width of 30 MHz. It is shown that, when the ME's belonging to a single rotational state are Fouriertransformed, the beating decays of these states are obtained. A problem is constituted by the lack of a fast component in these reconstructions, while it is observed in experiments on higher J-states.