We have measured the densities of 1s5 and 1s3 argon metastables as a function of the abundance of molecular oxygen in an inductively coupled plasma (ICP) in mixtures of Ar and O2. Laser absorption spectroscopy was used to determine the densities of the metastables. It was found that even small abundances of oxygen lead to large increases in metastable density, mostly due to the reduction in the electron number density, since electron-induced quenching determines the metastable density. At abundances higher than 7% to 15% for powers between 50 and 150 W, quenching by oxygen molecules begins to dominate and the metastable density drops again.
Optical emission spectroscopy by an intensified charge coupled device camera is employed to investigate a temporal transition from E-to H-mode in an inductively coupled plasma in Ar. The axially integrated 2-D emission image of Ar (2p 1 ) shows the temporal change of the active area for the plasma production as a function of time.Index Terms-E-H transition, inductively coupled plasmas (ICPs), optical emission spectroscopy (OES).
A case of a rupture of splenic artery aneurysm, which is considered a rare condition, was successfully diagnosed preoperatively and treated. A review of the cases documented in Japan is also reported. A 60-year-old female was referred to us with complaints of sudden onset of epigastralgia and nausea. A child's fist sized, elastic hard mass with smooth surface in the left upper quadrant of the abdomen led the patient to receive Severe anemia indicated an emergency laparotomy on the next day after admission. The aneurysm was found to be so close to the celiac axis that the abdominal aorta was clamped and the aneurysm was treated with aneurysmotomy and arteriorraphy, following splenectomy. The patient made an excellent recovery and was sent home on the 24th postoperative day. As far as we could find in documents, this case was the 31st one in Japan. Splenic artery aneurysms will be diagnosed more frequently because of further improvement of diagnostic techniques such as angiography.
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