Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
DISPERSED FLUORESCENCE-SPECTRUM OF ACETYLENE FROM THE (A)OVER-TILDE (1)A(U) ORIGIN - RECOGNITION OF POLYADS AND TEST OF MULTIRESONANT EFFECTIVE HAMILTONIAN MODEL FOR THE (X)OVER-TILDE STATE
Autore:
SOLINA SAB; OBRIEN JP; FIELD RW; POLIK WF;
Indirizzi:
MIT,DEPT CHEM CAMBRIDGE MA 02139 MIT,DEPT CHEM CAMBRIDGE MA 02139 MIT,GEORGE R HARRISON SPECT LAB CAMBRIDGE MA 02139 HOPE COLL,DEPT CHEM HOLLAND MI 49423
Titolo Testata:
Journal of physical chemistry
fascicolo: 19, volume: 100, anno: 1996,
pagine: 7797 - 7809
SICI:
0022-3654(1996)100:19<7797:DFOAFT>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
HIGHLY EXCITED ACETYLENE; APPROXIMATE CONSTANTS; VIBRATIONAL LEVELS; ENERGY; ROTATION; SYSTEMS; MOTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
27
Recensione:
Indirizzi per estratti:
Citazione:
S.A.B. Solina et al., "DISPERSED FLUORESCENCE-SPECTRUM OF ACETYLENE FROM THE (A)OVER-TILDE (1)A(U) ORIGIN - RECOGNITION OF POLYADS AND TEST OF MULTIRESONANT EFFECTIVE HAMILTONIAN MODEL FOR THE (X)OVER-TILDE STATE", Journal of physical chemistry, 100(19), 1996, pp. 7797-7809

Abstract

We have recorded a high-resolution dispersed fluorescence (DF) spectrum of the (A) over tilde (1)A(u) --> (X) over tilde (1) Sigma(g)(+) transition of acetylene-h(2), utilizing the zero-point level of the (A) over tilde (1)A(u) state, Here we present only the analysis of the vibrational levels of the (X) over tilde-state with E(vib) < 10 000 cm(-1). By comparing the observed and calculated spectral intensity patterns, we have estimated the previously undetermined pure bend vibrationalconstant, s(45)(h2), to be -11(2) cm(-1). Unlike previously recorded DF spectra, this DF spectrum is uniquely suited for comparison with aneffective Hamiltonian since (1) the Franck-Condon envelope facilitates observation of levels at lower E(vib) in the (X) over tilde-state, (2) the improved resolution is sufficient to observe intramolecular vibrational redistribution (IVR) at lower E(vib), and (3) spectral features are no longer absent because of nodal patterns in the Franck-Condonenvelope. Our comparison shows that our current effective Hamiltonianmodel, (H) over cap(eff)(R), can qualitatively describe the IVR pathways on the (X) over tilde-state for chromostates (zero-order bright states) which contain high excitation in the trans-bend (upsilon(4) lessthan or equal to 12). The failure of our (H) over cap(eff)(R) model for chromostates which contain excitation in both the CC stretch (upsilon(2)) and the trans-bend (upsilon(4) > 8) may be attributed to a new stretch-bend or stretch-only resonance. Comparison of the present DF spectrum to prior SEP spectra has allowed us to make plausible rotational and vibrational assignments for previously unassigned transitions in the SEP spectra.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 11:56:20