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The energy shifts and intensity ratios of different L X-ray components in tantalum element due to 10 MeV carbon and 12 MeV nitrogen ions are estimated. From the observed energy shifts, the possible number of simultaneous vacancies in M shell are estimated. A comparison of L α /L β 2 15 , L β1 /L γ1 and L γ2 3 /L γ4 4 with the ratios due to Scofield theoretical transition rates indicate that the number of multiple vacancies in N shell are higher than the vacancies in M and O shell. Employing Larkin's statistical scaling procedure, the number of possible multiple vacancies in N and O shells are estimated quantitatively.Keywords. L X-ray energy shifts and intensity ratios; heavy ions; estimation of multiple vacancies in M, N, O shells. PACSNos 32.80.Hd; 32.30.Rj; 41.75.-i; 41.75.Ak

An attempt has been made to forecast the all-India monsoon rainfall by using 30 years ' pre-monsoon upper-air mean temperatures (recorded between 1959 and 1988) (1989−1990). The forecast values are found to be reasonably good.