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Volumn 129, Issue 16, 2008, Pages

Optical observation of the C, 3sσ gF3, and 3pπuG3 3Πu states of N 2

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EID: 55449137240     PISSN: 00219606     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.2990655     Document Type: Article
Times cited : (26)

References (56)
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    • Preliminary results from the C-X (7,0) and (8,0) spectra presented here have already been used in the development of the CSE model of Ref..
    • Preliminary results from the C-X (7,0) and (8,0) spectra presented here have already been used in the development of the CSE model of Ref..
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    • It was assumed that A>0 for this relatively low level of the C state, i.e., of the same sign as the values determined for all known lower- v levels (Ref.).
    • It was assumed that A>0 for this relatively low level of the C state, i.e., of the same sign as the values determined for all known lower- v levels (Ref.).
  • 36
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    • Despite the low temperature of the absorbing N2, hot bands also appear in the recorded spectra. This occurs because of the placement of the windowless absorption cell between the discharge source and the spectrograph, which results in some vibrationally excited N2 in the absorption path.
    • Despite the low temperature of the absorbing N2, hot bands also appear in the recorded spectra. This occurs because of the placement of the windowless absorption cell between the discharge source and the spectrograph, which results in some vibrationally excited N2 in the absorption path.
  • 37
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    • The R (2) and R (3) lines of the o-X (0,0) band coincide due to an additional perturbation by the D (v=1) state.
    • The R (2) and R (3) lines of the o-X (0,0) band coincide due to an additional perturbation by the D (v=1) state.
  • 38
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    • The N 15 2 o (v=0) terms of Ref. were supplemented by a Te (15) value of 106 019.555 cm-1, from a new assignment of a shoulder in the spectrum to R (14).
    • The N 15 2 o (v=0) terms of Ref. were supplemented by a Te (15) value of 106 019.555 cm-1, from a new assignment of a shoulder in the spectrum to R (14).
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    • A few preliminary results from the PDA-based study have been presented in Ref..
    • A few preliminary results from the PDA-based study have been presented in Ref..
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    • Term-value fits for A chosen to be positive or negative both imply that AD /A is negative. The inverted F Π3 u (v=1) level, which lies ∼60 cm-1 above C Π3 u (v=14) (see Sec.), perturbs its spectroscopic constants electrostatically. Since the Rydberg F (v=1) state has larger values of A and B than those of the valence C (v=14) state, the observed AD /A<0 implies that A<0 for the latter state. If A were positive, then this perturbation would result in AD /A having quite a large positive value and λ probably being of opposite sign to that observed.
    • Term-value fits for A chosen to be positive or negative both imply that AD /A is negative. The inverted F Π3 u (v=1) level, which lies ∼60 cm-1 above C Π3 u (v=14) (see Sec.), perturbs its spectroscopic constants electrostatically. Since the Rydberg F (v=1) state has larger values of A and B than those of the valence C (v=14) state, the observed AD /A<0 implies that A<0 for the latter state. If A were positive, then this perturbation would result in AD /A having quite a large positive value and λ probably being of opposite sign to that observed.
  • 44
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    • For this conclusion, it is assumed that predissociation is the dominant decay process.
    • For this conclusion, it is assumed that predissociation is the dominant decay process.
  • 46
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    • At LN2 temperature, the Q (2) line from a Π1 u -X 1 g+ transition, or a central subband Π3 u1 -X 1 g+ transition which borrows strength from this allowed transition, is significantly stronger than the R (4) line. However, the Π3 u0 ∼ Π3 u1 rotational mixing is strongly J dependent, resulting in the R (4) line becoming significantly stronger than the Q (2) line in the Π3 u0 -X 1 g+ subband.
    • At LN2 temperature, the Q (2) line from a Π1 u -X 1 g+ transition, or a central subband Π3 u1 -X 1 g+ transition which borrows strength from this allowed transition, is significantly stronger than the R (4) line. However, the Π3 u0 ∼ Π3 u1 rotational mixing is strongly J dependent, resulting in the R (4) line becoming significantly stronger than the Q (2) line in the Π3 u0 -X 1 g+ subband.
  • 49
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  • 52
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    • K. Yoshino (http://cfa-www.harvard.edu/amp/ampdata/cfamols.html).
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  • 53
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    • While no local perturbation was observed corresponding to the expected b Π1 u1 (v=4) ∼G Π3 u1 (v=0) crossing, a single perturbation at J=22e, with H12 =0.40 (2) cm-1, was found, which we believe to be caused by an additional crossing by the b′ 1 u+ (v=0) state.
    • While no local perturbation was observed corresponding to the expected b Π1 u1 (v=4) ∼G Π3 u1 (v=0) crossing, a single perturbation at J=22e, with H12 =0.40 (2) cm-1, was found, which we believe to be caused by an additional crossing by the b′ 1 u+ (v=0) state.
  • 55
    • 55449095910 scopus 로고    scopus 로고
    • Using the ωe and ωe xe values for the A Π2 u state of N2+ and the X 1 g+ state of N2 given in Ref., together with the usual isotopic relation (Ref.), one finds an A-X (1,0) isotopic shift of ∼55 cm-1. The actual shift for F-X (1,0) differs somewhat because of the strong interactions within the Π3 u manifold of N2.
    • Using the ωe and ωe xe values for the A Π2 u state of N2+ and the X 1 g+ state of N2 given in Ref., together with the usual isotopic relation (Ref.), one finds an A-X (1,0) isotopic shift of ∼55 cm-1. The actual shift for F-X (1,0) differs somewhat because of the strong interactions within the Π3 u manifold of N2.


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