Optical isotope shifts in titanium I: new measurements

Abstract

The optical isotope shifts between Ti, Ti andTi have been measured for eight 3d 4s a F-3d 4s 4p y F lines of titanium by use of a Doppler-free experiment. By contrast with the positive shifts previously measured for 3d 4s a F-3d 4s 4p z D lines, these shifts are negative and reveal the presence of large negative specific mass shifts attributed to a d-p electron jump. The interpretation of the present measurements and of former ones is made by means of HartreeFock calculations.

Hyperfine structure and isotope shift analysis of singly ionized titanium

“…7 2 , µ I = −1.10414µ N for 49 Ti and the relation: a 10 4s = 95.4218g I r −3 10 4s = 63.6145g I 4π|ψ(0)| 2 , one obtains the single-electron HFS value a 10 4s = −750.55 MHz, which represents only the relativistic contributions. We must include…”

“…This time we propose a similar study concerning Ti II in order to extend this kind of analysis to this third ion located in the same row of the periodic table. HFS and IS of atomic titanium have been largely and extensively studied during the last two decades [3][4][5][6][7][8][9][10] but only a few measurements and analyses have been carried out so far for Ti II [11][12][13][14]. The first highest resolution achieved experimentally for Ti II was by Gianfrani et al [11], who used laser polarization spectroscopy on a hollow cathode discharge.…”

Precise wave-number calibration in molecular spectra: the case of Ti

“…It may be worthwhile to mention that the same program of acquisitio n and analysis was also used for the accurate measurement of optical isotope shifts in titanium atoms. Then, only a relativ e calibration of the wave-numbers was needed, the shifts being m easured with an uncertainty of 6 MHz (0,0002 cm ±1 ) [27].…”

Lasers semicondutores em cavidade estendida aplicados à espectroscopia de alta resolução

“…A separação dos desvios de campo mostrou um interessante efeito de agrupamento ('staggering'), em que os isótopos ímpares situam-se marcadamente mais próximos dos isótopos vizinhos pares mais pesados. Posteriormente, em 1996 [21], este grupo estudou transições partindo do nível metaestável a 5 Fi , fracamente populado no feixe atómico, ao nível ímpar superior…”

“…Os átomos são ejetados da superfície do catado com alta energia cinética inicial ( 1 a 5 e V [52]), mas ao se difundirem entram rápidamente em equilíbrio térmico com o gás. Uma utilização imediata deste efeito é feita no estudo de elementos refratários como titânio, ferro, tungsténio, etc ... , que necessitam de altíssimas temperaturas para serem evaporados ( ou então esquemas alternativos como 'electron-bearns' e lasers pulsados [20,21,24,28]).…”