巻号一覧
56 巻 (2008)
- 6 号 p. 247-
- 5 号 p. 215-
- 4 号 p. 181-
- 3 号 p. 77-
- 2 号 p. 33-
- 1 号 p. 1-
56 巻, 2 号
選択された号の論文の9件中1～9を表示しています
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一般論文
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森 邦彦, 平岡 賢三2008 年 56 巻 2 号 p. 33-39
発行日: 2008/04/01
公開日: 2008/04/15
ジャーナル フリーCharged droplets formed by atmospheric pressure electrospray are injected through an orifice into vacuum, which strike sample molecules deposited on a metal substrate. To investigate the energetics in electrospray droplet impact (EDI), 4-chlorobenzylpyridinium chloride salt was used as a thermometer molecule. The only fragmentation ion observed was the pyridinium ion. The internal energy distribution of the secondary molecular ion was estimated by the “Survival yield” method. It was revealed that 2.88 eV was transferred to the secondary ion as an internal energy by the impact of 106 eV projectiles, [(H2O)90000+100H]100+.抄録全体を表示PDF形式でダウンロード (953K)
技術報告
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雲岡 義雄2008 年 56 巻 2 号 p. 41-48
発行日: 2008/04/01
公開日: 2008/04/15
ジャーナル フリーCommercial aromatic petroleum resins and coumarone resins, the representative tackifiers that constitute pressure-sensitive adhesives (PSAs), were analyzed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS). The optimum analytical method uses dithranol as a matrix with silver trifluoroacetate as a cationizing agent. The aromatic petroleum resins are prepared from C8-C10 fraction produced by petroleum cracking, and the coumarone resins are prepared from indene-coumarone fraction of coal tar. The representative monomer of the C8-C10 fraction is vinyltoluene and those of the indene-coumarone fraction is coumarone. The other major reactive monomers are common in both the fractions, which have similar molecular weights. These resins, however, showed characteristic mass spectra and were discriminated clearly based on their mass spectra. The ion distributions of their pentamers calculated under given monomer compositions also are nearly identical with those of the observed mass spectra. Acetone extracts of PSAs were analyzed by MALDI-TOF-MS, and an aromatic petroleum resin and a coumarone resin were identified successfully.抄録全体を表示PDF形式でダウンロード (858K)
解説
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田中 耕一, 吉野 健一, 内藤 康秀, 豊田 岐聡2008 年 56 巻 2 号 p. 49-54
発行日: 2008/04/01
公開日: 2008/04/15
ジャーナル フリーLinear mode, reflectron mode, and multi-turn are techniques for m/z analysis in time-of-flight mass spectrometry. Reflectron mode and multi-turn enable analysis to be performed with a higher mass resolving power than that attained with linear mode. In this commentary, starting from the basic principles of time-of-flight mass spectrometry in linear mode, the possible improvements in mass resolving power that can be made by reflectron mode and multi-turn techniques will be explained.抄録全体を表示PDF形式でダウンロード (1182K) -
吉野 健一2008 年 56 巻 2 号 p. 55-56
発行日: 2008/04/01
公開日: 2008/04/15
ジャーナル フリーPDF形式でダウンロード (161K) -
瀧浪 欣彦, 吉野 健一2008 年 56 巻 2 号 p. 57
発行日: 2008/04/01
公開日: 2008/04/15
ジャーナル フリーPDF形式でダウンロード (107K)
Letters to the Editor
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松田 久2008 年 56 巻 2 号 p. 59-61
発行日: 2008/04/01
公開日: 2008/04/15
ジャーナル フリーPDF形式でダウンロード (208K) -
山田 尚之2008 年 56 巻 2 号 p. 63-66
発行日: 2008/04/01
公開日: 2008/04/15
ジャーナル フリーPDF形式でダウンロード (1766K) -
古屋 裕子2008 年 56 巻 2 号 p. 67-68
発行日: 2008/04/01
公開日: 2008/04/15
ジャーナル フリーPDF形式でダウンロード (224K)
Letter from the Editor-in-Chief
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吉野 健一2008 年 56 巻 2 号 p. 69-76
発行日: 2008/04/01
公開日: 2008/04/15
ジャーナル フリーThe Japanese word “mirimasu” originates from the English words “milli” and “mass.” It is normally used as an alias for “measured accurate mass” and “accurate mass measurement.” It causes confusions that “mirimasu” is also used as an alias for “high resolution mass spectrometry,” “high resolution mass spectrum (spectra),” and “mass spectrometer with high mass resolving power.” This nomenclature results from the fact that “high resolution” is confused with “high accuracy.” In addition to these interpretations, Japanese mass spectrometrists also use “mirimasu” as an alias for “one-thousandth of a unified atomic mass unit,” “one-thousandth of a dalton (mDa),” and “one-thousandth of an m/z unit.” This incorrect usage is due to a lack of understanding of the unit system of atomic mass and m/z on mass spectra. Therefore, “mirimasu” should not be used in Japanese, because it is ambiguous and involves various problems and misunderstandings.抄録全体を表示PDF形式でダウンロード (746K)
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