B.D. Shrivastava

The L emission spectrum of europium 63

Using a 40 cm bent-crystal spectrograph of the transmission type, a detailed study of the L emission spectrum of europium 63 has been made. Four new diagram lines at 1609.4 XU, 1628.9 XU, 2015.8 XU and 2550.1 XU, corresponding, in that order, to the forbidden transitions L1N1 and LiIOII,III and the quadrupole transitions LIIMIII( beta 17) and LIIIMIII(s) have been observed for the first time. The presence of the quadrupole line LINIV,V( gamma 11) and the low frequency satellite L lambda 10 has been confirmed.

4f states of lanthanum in its oxide

Abstract Three new diagram lines have been observed at 1974.9, 2101.4 and 2258.1 X.U. in the L-spectrum of lanthanum using La2O3 as a target. These lines have been ascribed to LINVI,VII, LIINVi,VII and LIIINVI,VII transitions in La. The position of the NVI,VII(4f) states of La in its oxide has been calculated to be 2.7 eV below the Fermi level.

Satellite L αx in the L-emission spectrum of europium-63

Abstract The high frequency satellite L α x in the L-emission spectrum of europium-63 has been reported for the first time at λ = 2108.0 X.U. The origin of the satellite L α x has been ascribed to the transition L III M II →M II M V on the basis of the multiple ionization theory. The wavelength values calculated for this transition are found to be in good agreement with the measured values for the L α x satellite in all the elements in which it has been observed so far.

Satellite Lαx in the L-emission spectra of cerium-58 and praseodymium-59

The high-frequency satellite Lαx has been observed for the first time at 2544.5 and 2447.6 X.U. in the L-emission spectra of cerium-58 and praseodymium-59 respectively. The transition energies have been calculated for the satellite, using the semiempirical Auger electron energies in the doubly ionised atoms and they have been found to be in good agreement with the measured values in all the elements in which the satellite has been reported so far.

Satellite Lγ1′ in the l spectrum of lanthanum

Abstract The existence of the high-frequency satellite Lγ1′ in the X-ray spectrum of lanthanum is reported for the first time at λ = 2124.5 m A . The transition energies were calculated for the satellite using the semiempirical Auger electron energies in the doubly-ionized atoms and they were found to be in good agreement with the measured values in all the elements in which the satellite has so far been reported.

Origin of the high-and low-frequency K-satellites of 31Ga, 32Ge and 33As

Abstract The origin of the high- and low-frequency K-satellites of 31 Ga, 32 Ge, 33 As is explain on the basis of Hayasis theory of quasi-stationary states. It is shown that the same QSS difference gives rise to a particular satellite of either type in all the elements. The results are compared with those of multiple ionisation theory.

Lα and Lβ satellites of the heavy rare earths

Abstract Using the recently reported data on EXAFS at the L3 absorption edge, the origin of the Lα and Lβ satellites of the heavy rare earth metals has been explained, on the basis of Hayasis theory of quasi stationary states (QSS). It has been shown that the same QSS difference gives rise to a particular satellite in all the elements. The results have been compared with those of the multiple ionisation theory.

The ‘s’ line in the L spectrum of 62Sm

Abstract A 40 cm bent mica crystal spectrograph of the transmission type has been used to study the L emission spectrum of samarium. A new diagram line corresponding to the quadrupole transition L III M III ( s ) at λ = 2336.0 X . U has been reported for the first time. The presence of LIIMM I ( l ) transition, hitherto observed only by Coster in 1922, has been confirmed.