Tetrairidium dodecacarbonyl, Ir 4 (CO) 12 , is a massive compound called metal cluster complex, which has a molecular weight of 1104.9. Using an Ir 4 (CO) 7 þ primary ion beam, secondary ion mass spectrometry (SIMS) of boron-delta-doped silicon samples was performed. Depth resolution, defined by 1/e decay length for the trailing edge of the boron delta layer, was investigated in the beam energy ranging from 2.5 to 10 keV at an incident angle of 45 . Experimental results showed that the depth resolution improved with oxygen partial pressure at a beam energy of 5 keV. It was confirmed that the depth resolution without oxygen flooding monotonically improved as beam energy decreased. Furthermore, it was found that the favorable effect of oxygen flooding on depth resolution weakened as beam energy was reduced.

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A 26–38 GHz millimeter‐wave (MMW) band sub‐harmonic mixer has been designed using a 0.15‐μm GaAs pseudomorphic high‐electron‐mobility transistor (pHEMT) technology. The anti‐parallel diode pair (APDP) configuration as the basic unit in this sub‐harmonic mixer design to suppress the fundamental frequency signals is used. The radio‐frequency (RF) and the local oscillator (LO) signals are imported by two Lange couplers in the proposed design, with four pairs of APDPs connected in a ring structure. Superior RF/LO‐to‐IF (intermediate‐frequency) and 2LO‐to‐RF/IF isolations have been achieved. The sub‐harmonic mixer circuit has also exhibited excellent conversion loss of 13.7 dB with LO power of 13 dBm. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2135–2138, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23595