Observation and partial characterization of the 21 Σ+ u state in K2

Abstract

Laser excitation spectroscopy is performed on K2 molecules produced in a supersonic molecular beam. 83 vibrational levels of the 21 X+ state are observed under conditions permitting rotational resolution. The 21N + state is partially analysed and its preliminary potential curve is compared with theoretical calculations. 33.20.Kf; 35.20.Pa potential [20]. In the present experiment we ol~served for the first time a direct laser excitation of the 21Z,+ state in K2. The use of the supersonic beam of K2 molecules in conjunction with spectrally narrow laser light allowed us to obtain rotationally resolved excitation spectra. Some 83 vibrational levels were characterized and used to construct a partial potential curve of the investigated state. PACS:

Theoretical determination of highly excited states of K2 correlated adiabatically above K(4p)+K(4p)

“…Development of such lasers has led to the observation of 21 new molecular states [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] during the last decade. In particular since 1995, intense experimental investigations, mainly by optical-optical-double resonance ͑OODR͒ [12][13][14][15][17][18]20 and polarization labeling spectroscopy techniques 10,11,16,19,21 were achieved on highly electronic states correlated adiabatically to limits close to the doubly excited one K(4p)ϩK(4p).…”

3Πu1and 3Jastrzębski1, Kowalczyk2 1995Phys. Rev. ASelf Cite470190View full textAdd to dashboardCite

“…Apart from the spectral lines observed in the present experiment, 52 lines from the bandhead of the (20,0) transition studied under high resolution in the molecular-beam experiment [13,14] have been incorporated in the analysis. Preliminary fits showed that some local perturbations of the removed.…”

“…Unfortunately, such levels were not labeled in our experiment. Furthermore, the transitions in question are overlapped by lines of the C 'II"~X'Xg+ and 2 'X"+~X'Xs band systems [14,15]. Hence the vibrational numbering in the 3 'H"and 3 'X"+ states could not be obtained simply by assuming that the longestwavelength lines in the observed progressions correspond to U'=0.…”

Observations and spectral simulations of the7Li2 21 Σ u + →X 1 Σ g + transition

“…The nuclear wavefunctions for particular rovibrational levels were shown to have interesting structure reflecting the existence of a barrier between the inner and the outer well. Recently the 2 527+ state in K 2 was observed using a supersonic molecular beam and a laser excitation spectroscopy [5].…”