研究目的
To investigate the saturation of transitions of the three-stage photoionization scheme in order to determine the effective excitation cross sections of different HFS components for 175Lu, 176Lu, 177Lu, and 177mLu isotopes.
研究成果
The experiments on studying the splitting of transitions at significantly different Rabi frequencies made it possible to measure the Rabi frequency and determine the relation between the measured effective absorption cross sections and the Einstein coefficient. The absorption cross section of the 175Lu second transition of 1.6(3) × 10–12 cm2 corresponds to the Einstein coefficient of 8(1) × 105 1/s.
研究不足
The cross sections of not all first-transition HFS lines can be measured according to the above-described technique. Some lines are spaced by a distance of 150–400 MHz from the excitation lines of the other lower sublevels.
The studies were carried out on a system designed for experiments on laser photoionization spectroscopy in narrow collimated atomic beams, which makes it possible to determine the isotopic composition of photoions. The system consists of a vacuum chamber with a pumping system, an evaporator, and an MS-7302 quadrupole mass spectrometer. The atomic beam formed by the evaporator falls in the source of ions of the mass spectrometer. The resonance excitation and ionization of atoms were performed using radiations of three pulsed single-mode dye lasers (DLs) with a spectral lasing linewidth of 100–150 MHz (FWHM) pumped by copper-vapor lasers. The laser beams and the atomic beam are crossed directly in the ionization chamber of the source of ions. The directions of the atomic beam, laser beams, and ion-optical axis of the mass spectrometer are orthogonal. Ions are detected in the mass spectrometer by a secondary-electron multiplier (SEM). The DL wavelengths are monitored by means of precise wavelength meters.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
