Effect of Stereoregularity on TOF-SIMS Spectra of Polymers

Zimmerman, Paul; Hercules, David M.

doi:10.1366/0003702944924853

Cited by 20 publications

(13 citation statements)

References 5 publications

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“…On a special note, we have omitted the pDFB So fundamental vlP from the listing in Table 1 even though it has been assigned as 1437 cm-I in older studieP and as 1633 cm-' in the most recent. 16 The older assignment is ruled out on the basis of infrared band contours. '6 New ab initio calculations of both frequencies and relative band intensities rule out the 1633 an-' revision.19 ' Ihe correct frequency is probably near 1420 an-'.…”

Section: Discussionmentioning

confidence: 99%

The Relative Influences of Ring Modes and Methyl Internal Rotation on the Cold Beam IVR of p‐Fluorotoluene

Quan

Parmenter

Stone

et al. 1997

Israel Journal of Chemistry

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Abstract. Room temperature (300 K) experiments have earlier established that the replacement of a fluorine atom in p-difluorobenzene (pDFB) with a methyl group to make p-fluorotoluene @FT) generates a qualitative difference in intramolecular vibrational redistribution (IVR) characteristics as seen in the S, states. Here we report S , S , fluorescence excitation and dispersed single vibronic level (SVL) fluorescence spectra that have been obtained for IVR comparisons in the cold (5 K) environment of supersonic expansions. As in the 300 K experiments, the cold beam S, vibrational energy threshold for IVR is substantially lower in pFT. The vibrational congestion in dispersed fluorescence that reveals extensive S, level interactions first appears after pumping an S, pFT level near 800 cm-'. In contrast, congestion in pDFB spectra is still absent from levels with twice this energy. Attention is directed to the relative S, ring level structures as a potential contributor to the distinctive IVR behaviors. Dispersed fluorescence from the S, zero point levels and fluorescence excitation spectra are combined with published information about S, fundamentals to show that the S, vibrational level structures of the two molecules are as closely related as those of an isotopomer pair. It is argued that the small differences in S, fundamentals cannot be a principal contribution to the qualitative IVR differences.

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Section: Discussionmentioning

confidence: 99%

The Relative Influences of Ring Modes and Methyl Internal Rotation on the Cold Beam IVR of p‐Fluorotoluene

Quan

Parmenter

Stone

et al. 1997

Israel Journal of Chemistry

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“…Only recently has the use of ToF-SIMS to distinguish between polymers of di †erent stereoregularity been reported. 16 This was demonstrated for three polymers, which included isotactic and atactic PMMA.…”

Section: Introductionmentioning

confidence: 91%

Secondary Ion Mass Spectrometry of Polymers: a ToF SIMS Study of Monodispersed PMMA Standards

Leeson

Alexander

Short

et al. 1997

Surf. Interface Anal.

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“…3 After that, many studies concerning the structure of polymers have been conducted with this technique. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] However, it is difficult to apply it to the analysis of ultrathin substances and substances on uneven substrates, because of the need to transfer the substances to a silver substrate. It is also difficult to observe the ion images of the substances on the sample.…”

Section: Introductionmentioning

confidence: 99%

Molecular Weight Evaluation of Poly(dimethylsiloxane) on Solid Surfaces Using Silver Deposition/TOF-SIMS

Inoue¹,

Murase²,

Sugiura³

2004

ANAL. SCI.

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Molecular ions include information about end groups, functional groups and molecular weight. A method for the direct detection of these in the high mass range (m/z > 1000) from poly(dimethylsiloxane) (PDMS) on a solid surface was investigated. It was found that a TOF-SIMS analysis of silver-deposited surfaces (silver deposition/TOF-SIMS) is useful for this purpose. Using the silver-deposition/TOF-SIMS method, silver-cationized quasi-molecular ions were clearly detected from PDMS on solid surfaces, and their structure and molecular weight were evaluated. In addition, their images were observed without the interference of deposited silver. By applying to the analysis of paint defects etc., it was confirmed that this technique is useful to analyze actual industrial materials. Silver-cationized ions were detected not only from PDMS, but also from other organic materials, such as lubricant additives and oils on solid surfaces. Therefore, the silver deposition/TOF-SIMS method was proved to be useful for the analysis of ultrathin substances on solid surfaces.

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Effect of Stereoregularity on TOF-SIMS Spectra of Polymers

Cited by 20 publications

References 5 publications

The Relative Influences of Ring Modes and Methyl Internal Rotation on the Cold Beam IVR of p‐Fluorotoluene

The Relative Influences of Ring Modes and Methyl Internal Rotation on the Cold Beam IVR of p‐Fluorotoluene

Secondary Ion Mass Spectrometry of Polymers: a ToF SIMS Study of Monodispersed PMMA Standards

Molecular Weight Evaluation of Poly(dimethylsiloxane) on Solid Surfaces Using Silver Deposition/TOF-SIMS

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