The chemical and kinetic properties of singlet molecular oxygen in liquid phase have occupied the attention of chemists for almost 20 years as indicated by numerous reviews on the subject.1-9 This transient entity, however, has evaded direct observation until very recently when the 1.27-µ luminescence from the forbidden transition 02(3 456789 8~) *-02(*Ag) was detected via photosensitization

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DR plots are given for three carbons of series M with increasing degree of oxidation. These results may be summarized as follows:(i) The polarity of the adsorptive prevents the filling of the micropores at low relative pressures as noted by the decrease in slope ratios from N2 to HzO.(ii) The polar moment is not the only factor to explain the deviations (relative to N2) found for SO2, CH30H, and H20 (they have very similar values); neither is the hydrogen bond by itself because is similar for water and methanol. The most important factor seem to be a low nonspecific adsorbatecarbon interaction and a high adsorptive-adsorptive interaction.(iii) The differences between C H 3 0 H and SO2 suggest that hydrogen bond causes a larger deviation than the simple polar moment interaction.(iv) Increasing degree of oxidation increases the carbon-adsorbate interaction, the adsorption mechanism approaching then that of N2, micropore filling with the adsorbate as liquid. Acknowledgment. This work was supported by CICYTThe effect of substituted ferrocene complexes on the surface of quantum-confined (Q) cadmium sulfide clusters in inverse micelles was examined by steady-state and time-resolved photoluminescence (PL) spectroscopy. Addition of (dimethylamin0)methylferrocene (DMAMF) to Q-CdS enhanced cluster PL peak areas by 120%, in contrast to the carboxylic acid derivatives ferrocenecarboxylic acid (FCA) and ferrocenedicarboxylic acid (FDCA), which quenched PL by 60% and 80%, respectively. Unsubstituted ferrocene, hydroxymethylferrocene, and ferrocenecarboxaldehyde had no effect on the PL intensity of these clusters. The induced PL changes fit a Langmuir-type adsorption isotherm from which formation constants for the Q-CdSsurface adducts were calculated. The average log Kf value calculated for DMAMF adsorption was 4.12. FCA addition gave an average log Kf of 5.17, and the average log Kf value for FDCA addition was 6.14. Binding of the amino group of DMAMF to shal!ow trap states arising from Cd2+ sites is postulated as its mechanism for PL enhancement, while the quenching mechanism for FCA and FDCA is attributed to proton transfer induced from ionization of the acids in the micelle water pools. "Competition" experiments show that quenching by the carboxylic acid derivatives can be reversed by the addition of amino-substituted ferrocene, and vice versa. The results also suggest a possible DMAMF-induced surface reconstruction. These steady-state observations are supported by measurements of the PL decay via subnanosecond timecorrelated single photon counting. Fits of the decay monitored at 620 nm to a modified stretched exponential model indicate that the average distributed decay time ( T 2 ) of nanosecond duration can be either lengthened or shortened, depending on the nature of the added ferrocene.

Previous efforts to obtain information from onboard sensors involved writing the data to an EPROM located in the launch package, performing a "soft" catch of the projectile, and recovering the chip in order to download the data. This method requires soft catch capability and has been limited to velocities of less than 1 k d s . We have developed a method to measure in-bore quantities on board a railgun launch package and transmit the information out of the barrel in real time using an optical data link. The onboard transmitter, which is mounted on the front end of the launch package, is either a repackaged laser diode or a high intensity LED. During launch, light pulses are transmitted down the bore, reflected off a mirror just outside the muzzle, and received with a telescope and attached photomultiplier tube. Successful operation has been achieved for accelerations up to 105 kgees and velocities up to 2.0 k d s . An analog encoded version of the system has been built and used to perform an armature voltage measurement.Zndex Terms-g-hardened electronics, high-g acceleration, inbore diagnostics, optical telemetry, railguns.

Mit Hinweis auf die Annahme, daß viele photobiologische Wirkungen über den O2(1Δg)‐Zwischenzustand (Singulett‐O2) verlaufen, wurde dessen Lebensdauer in H2O zur 4.5 ps bestimmt.