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A method for the preparation of a well aligned silver behenate sample is described. Multiple (0 0 l) diffraction peaks, (0 0 1) to (0 0 48), are easily observed using a conventional laboratory X‐ray diffraction instrument.

We report the results of femtosecond optical transient absorption experiments performed on the superconducting compounds YBa2Cu307x(X-0) and Bi2Sr2Ca2Cu301O+b(8-0) and nonsuperconducting YBa2Cu306 1-yCy < 0.4) for sample temperatures ranging from

composition of such a complex cannot be deduced from our results. We only know that the Sn: Pd ratio is about 2:1 and that an excess of C1 is present before heating in water. Whether the Pd occurs in a univalent or a bivalent state is not known.No suggestion can be made about the mechanism of initiation of the nickel deposition of the nucleated glass surface. We could not detect a metallic film after a treatment with a hypophosphite solution. Possibly the Sn-Pd complex reduces the nickel-ions. Further study is necessary to solve this problem. AcknowledgmentThe authors wish to thank J. R. ABSTRACTA chemical plating technique has been devised for the preparation of semitransparent photomasks. The deposited thin film meets the optical requirement of being opaque in the ultraviolet range and transparent enough in the visible range for see-through applications. Suitable etchants are available to provide good edge definition of photolithographically delineated semitransparent films without deteriorating common resist compositions. Analytical characterization of the deposited films revealed that they are primarily composed of cuprous oxide. The major advantage of the present approach is the low cost. Masks made by the present system are more durable (harder) than emulsiontype masks, but less durable than iron oxide semitransparent masks.In the manufacturing of electronic parts, photomasks are widely used in defining images on photosensitive * Electrochemical Society Active Member.