High-resolution threshold photoelectron spectroscopy of hydrogen iodide

Cormack, A.J.; Yencha, Andrew J.; Donovan, Robert J.; Lawley, Kenneth P.; Hopkirk, A.; King, G C

doi:10.1016/s0301-0104(97)00129-8

Cited by 25 publications

(22 citation statements)

References 44 publications

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“…The spin-orbit splitting between the 2 P 3 / 2 -2 P 1/2 states in the free iodine atom is 0.943 eV [30] whereas it is 1.306 eV in the isoelectronic Xe + ion [32]. It is noteworthy that in the HI + cation the same coupling has a value of 0.657 eV [33] …”

Section: Discussion Of the Experimental Datamentioning

confidence: 99%

Medium and high resolution vacuum UV photoabsorption spectroscopy of methyl iodide (CH3I) and its deuterated isotopomers CD3I and CH2DI. A Rydberg series analysis

et al. 2009

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The vacuum UV photoabsorption spectrum of CH 3 I has been investigated between 5 eV and 20 eV. Numerous vibronic transitions are observed. In the high 10-20 eV photon energy range weak to very weak diffuse bands are observed and ascribed to electronic transitions from 3a 1 , 1e and 2a 1 to Rydberg orbitals. In the 6-10.5 eV photon energy range more than 200 sharp and strong to weak lines have been observed. Several photon energy ranges were explored under high resolution conditions allowing us to observe many series up to high values of the principal quantum number n. They are assigned to vibration-less Rydberg transitions and classified into two groups converging to the two components of the spin-orbit split X 2 E state of CH 3 I + . These two groups consist of six different Rydberg series, i.e., nsa 1 , npa 1 , npe, nda 1 , nde and nf. A very close correlation has been established between the term values of the Rydberg states in CH 3 I and in Xe for ns, np, nd and nf Rydberg transitions. For the first time, the same measurements have been performed and the interpretation has been proposed for the photoabsorption spectrum of CH 2 DI and CD 3 I in the 6-10.5 eV photon energy range. For these two species, ionization energies are deduced: for the X 2 E 3/2 and X 2 E 1/2 states of CH 2 DI, these are IE ad = 9.544 eV and IE ad = 10.168 eV, respectively, and the corresponding energies are 9.552 eV and 10.173 eV in CD 3 I.

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Section: Discussion Of the Experimental Datamentioning

confidence: 99%

Medium and high resolution vacuum UV photoabsorption spectroscopy of methyl iodide (CH3I) and its deuterated isotopomers CD3I and CH2DI. A Rydberg series analysis

et al. 2009

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“…the vibrational distribution, identified in our previous paper on the TPES of HI as the energy position of a ''missing'' vibrational band. 1 Actually, this position corresponds to a slight peak within the ''hole'' best seen in the TPE spectrum.…”

Section: Resultsmentioning

confidence: 93%

“…The repulsive limb of the A 2 ⌺ 1/2 ϩ state at long distances has predominantly 4 ⌺ Ϫ character, but contributions from the other states are also significant in agreement with an earlier interpretation. 1 The A 2 ⌺ 1/2 ϩ potential well is calculated to be only 134 cm Ϫ1 deep, which is not enough to support any stable vibrational levels. However, employing the complex rotation method, 12 allows one to calculate energies, E v ϩ, energy separations, ⌬E v ϩ, and predissociation linewidths, ⌫ v ϩ, for the nonstationary vibrational levels ͑or resonances͒ of the A 2 ⌺ 1/2 ϩ state of HI ϩ and DI ϩ .…”

Section: Theoretical Resultsmentioning

confidence: 95%

“…In the upper panel the He I PE spectrum of HI is compared directly with the TPE spectrum of HI at the identical resolution of 6 meV. 1 As can be seen, the two spectra are very similar in their features, even to the unusual vibrational band shapes, where the peaks appear to broaden to higher binding energy and then narrow toward the maximum in the electronic-state band system. We take this maximum in the band system to indicate the onset of the dissociation continuum of this state.…”

Section: Resultsmentioning

confidence: 97%

“…1 These findings were remarkable in three additional respects. First, the dominant vibrational spacings were found to be about half of what one would expect from a linear extrapolation of the vibrational constants of the A 2 ⌺ ϩ state of HCl ϩ and HBr ϩ .…”

Section: Introductionmentioning

confidence: 86%

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