High-resolution spectra of the B1Π→X1Σ+ transition of 23Na85Rb molecule are measured by the technique of the Doppler-free optical–optical double resonance polarization spectroscopy (OODRPS). The molecular constants of the X1Σ+(v″=5−30) levels are determined, and the potential energy curve is constructed up to v″=30 by the RKR method. The time-resolved fluorescence intensity following the excitation to the B1Π(v′=5,J′= around 20) level is measured, and the lifetime of the B1Π(v′=5) level in collisionless limit is determined to be 17.8 ns. The absolute value of the electric dipole moment of the B1Π−X1Σ+ transition is determined to be 7.0 D in the region of 3.73 Å<R<4.98 Å. Transition lines to the (1)3Σ+ state from the B1Π(v′=8,J′=15) level, which is perturbed by the (1)3Π1(v0,N=J=15) level, are measured by the Doppler-free OODRPS. The energy spacing between the F1 and F3 components of the (1)3Σ+(v=4,N=15) level is observed to be smaller than 0.001 cm−1. The hyperfine splittings, which are described by Hund’s case (bβS), are observed, and the hyperfine constants ANa and ARb of the (1)3Σ+(v=4) level are determined to be 0.0293 and 0.0336 cm−1, respectively. The hyperfine splittings are identified as originating from the Fermi contact interaction. From the analysis, it is concluded that the electron spins in the (1)3Σ+ state are almost equally populated to the 5sRb and 3sNa orbitals.
This paper presents a 1.728Gbps transmit baseband filter for transmitters of millimeter-wave communication systems. In order to avoid the inter symbol interference, ultra wide band and very high order filter is demanded. It is impracticable to realize such a high order filter with conventional analog technique, such as gm-C filter. The proposed filter consists of a 3.456GHz digital filter followed by an 8-bit 3.456Gsps digital to analog converter (DAC), which occupies 0.265mm 2 in 110nm CMOS processes. It is difficult to adjust the clock and data delay at 3.456GHz. The DAC has a clock divider for the high speed operation. The new filter consumes 142mW and achieves the transmit spectrum very close to the mask regulated by IEEE802.15.3c.
Observation of the 39K2 a 3Σ+ u state by perturbation facilitated optical-optical double resonance resolved fluorescence spectroscopy J. Chem. Phys. 93, 8452 (1990); 10.1063/1.459283Emission, optical-optical double resonance, and excited state absorption spectroscopy of matrix isolated chromium and molybdenum atoms
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