K2 un RbCs molekulu elektronisko stāvokļu analīze, izmantojot augstas izšķirtspējas lāzeru inducētās fluorescences spektrus
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Latvijas Universitāte
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lav
Abstract
Bakalaura darbā veikta K2 molekulas elektroniskā pamatstāvokļa X^1 Σ_g^+ un RbCs molekulas ierosinātā stāvokļa c^3 Σ_u^+ izpēte, pielietojot ar lāzeru inducētās fluorescences (LIF) metodi. Analizēta K2 molekulas X^1 Σ_g^+ stāvokļa svārstību – rotācijas līmeņu v”, J” struktūra un veikts salīdzinājums ar struktūru, kas izriet no zinātniskajā literatūrā atrodamajām potenciālās enerģijas līknēm un Danhema koeficientiem. Šim nolūkam analizēti K2 molekulas A^1 Σ_u^+-b^3 Σ_u^+→X^1 Σ_g^+ sistēmas LIF augstas izšķirtspējas spektri, kas reģistrēti ar Furjē spektrometru, un noteiktas spektrāllīniju pozīcijas daudzās LIF v’, J’→v_i”,J_i” progresijās. Dati par c^3 Σ_u^+ stāvokļa v^',J' enerģijas vērtībām izotopologiem 85Rb133Cs un 87Rb133Cs tika izmantoti, lai noteiktu absolūto svārstību līmeņu numerāciju šajā stāvoklī. Iegūtas tuvinātas c^3 Σ_u^+ stāvokļa molekulārās konstantes.
In the bachelor's thesis, the electronic ground state X^1 Σ_g^+ of the K2 molecule and the excited state c^3 Σ_u^+ of the RbCs molecule were investigated using the laser-induced fluorescence (LIF) method. The structure of the vibrational-rotational levels v”, J” in X^1 Σ_g^+ state of the K2 molecule was analyzed and was compared with those from the potential energy curves and the Dunham coefficients from literature. For this purpose, the LIF high-resolution spectra of the K2 molecule A^1 Σ_u^+-b^3 Σ_u^+→X^1 Σ_g^+ system obtained with a Fourier spectrometer were analyzed, and positions of spectral lines in LIF progressions v’, J’→v_i”,J_i” were determined. The data on v^',J' energy values of c^3 Σ_u^+ state for isotopologues 85Rb133Cs and 87Rb133Cs have been used to determine the absolute v' numeration in this state. Approximate molecular constants of c^3 Σ_u^+ state were obtained.
In the bachelor's thesis, the electronic ground state X^1 Σ_g^+ of the K2 molecule and the excited state c^3 Σ_u^+ of the RbCs molecule were investigated using the laser-induced fluorescence (LIF) method. The structure of the vibrational-rotational levels v”, J” in X^1 Σ_g^+ state of the K2 molecule was analyzed and was compared with those from the potential energy curves and the Dunham coefficients from literature. For this purpose, the LIF high-resolution spectra of the K2 molecule A^1 Σ_u^+-b^3 Σ_u^+→X^1 Σ_g^+ system obtained with a Fourier spectrometer were analyzed, and positions of spectral lines in LIF progressions v’, J’→v_i”,J_i” were determined. The data on v^',J' energy values of c^3 Σ_u^+ state for isotopologues 85Rb133Cs and 87Rb133Cs have been used to determine the absolute v' numeration in this state. Approximate molecular constants of c^3 Σ_u^+ state were obtained.