A mechanical pencil lead or a dress pin absorbs electromagnetic waves emitted from a kitchen microwave as an antenna, both ends of which emit electrons. They ionize the surrounding gas molecules, and microwave-excited plasma is produced. The statistical properties (level statistics) of the energy-level spacing of spectroscopy of this plasma are discussed. It is known that different geometrical structures of the phase space in a classical system (for example, "islands" indicating periodicity and chaotic "seas") correspond to different statistical properties of energylevel spacing in a quantum system. The characteristics of level repulsions and attractions are reflected in a functional form of probability distribution functions of level spacing. From this viewpoint of quantum chaos, the energy spectra of the microwaveexcited plasma are considered.シャープペンの芯や待ち針は電子レンジのマイクロ波をよく吸収し, 加速された電子は両端から飛び出す. それは周囲の気体分子を電離させ, プラズマが生じる. このプラズマの分光解析を行う. 古典系の相空間の幾何学的構造(周期性を表す「島」やカオスの「海」)が対応する量子系のエネルギー準位の統計性に反映されることが知られているが, その観点を踏まえ, このプラズマの準位間隔の分布関数を求める
